<h3>Düzenle: class-wp-date-query.php</h3>
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/**
 * Class for generating SQL clauses that filter a primary query according to date.
 *
 * WP_Date_Query is a helper that allows primary query classes, such as WP_Query, to filter
 * their results by date columns, by generating `WHERE` subclauses to be attached to the
 * primary SQL query string.
 *
 * Attempting to filter by an invalid date value (eg month=13) will generate SQL that will
 * return no results. In these cases, a _doing_it_wrong() error notice is also thrown.
 * See WP_Date_Query::validate_date_values().
 *
 * @link https://developer.wordpress.org/reference/classes/wp_query/
 *
 * @since 3.7.0
 */
#[AllowDynamicProperties]
class WP_Date_Query {
	/**
	 * Array of date queries.
	 *
	 * See WP_Date_Query::__construct() for information on date query arguments.
	 *
	 * @since 3.7.0
	 * @var array
	 */
	public $queries = array();

	/**
	 * The default relation between top-level queries. Can be either &#039;AND&#039; or &#039;OR&#039;.
	 *
	 * @since 3.7.0
	 * @var string
	 */
	public $relation = &#039;AND&#039;;

	/**
	 * The column to query against. Can be changed via the query arguments.
	 *
	 * @since 3.7.0
	 * @var string
	 */
	public $column = &#039;post_date&#039;;

	/**
	 * The value comparison operator. Can be changed via the query arguments.
	 *
	 * @since 3.7.0
	 * @var string
	 */
	public $compare = &#039;=&#039;;

	/**
	 * Supported time-related parameter keys.
	 *
	 * @since 4.1.0
	 * @var string[]
	 */
	public $time_keys = array( &#039;after&#039;, &#039;before&#039;, &#039;year&#039;, &#039;month&#039;, &#039;monthnum&#039;, &#039;week&#039;, &#039;w&#039;, &#039;dayofyear&#039;, &#039;day&#039;, &#039;dayofweek&#039;, &#039;dayofweek_iso&#039;, &#039;hour&#039;, &#039;minute&#039;, &#039;second&#039; );

	/**
	 * Constructor.
	 *
	 * Time-related parameters that normally require integer values (&#039;year&#039;, &#039;month&#039;, &#039;week&#039;, &#039;dayofyear&#039;, &#039;day&#039;,
	 * &#039;dayofweek&#039;, &#039;dayofweek_iso&#039;, &#039;hour&#039;, &#039;minute&#039;, &#039;second&#039;) accept arrays of integers for some values of
	 * &#039;compare&#039;. When &#039;compare&#039; is &#039;IN&#039; or &#039;NOT IN&#039;, arrays are accepted; when &#039;compare&#039; is &#039;BETWEEN&#039; or &#039;NOT
	 * BETWEEN&#039;, arrays of two valid values are required. See individual argument descriptions for accepted values.
	 *
	 * @since 3.7.0
	 * @since 4.0.0 The $inclusive logic was updated to include all times within the date range.
	 * @since 4.1.0 Introduced &#039;dayofweek_iso&#039; time type parameter.
	 *
	 * @param array  $date_query {
	 *     Array of date query clauses.
	 *
	 *     @type array ...$0 {
	 *         @type string $column   Optional. The column to query against. If undefined, inherits the value of
	 *                                the `$default_column` parameter. See WP_Date_Query::validate_column() and
	 *                                the {@see &#039;date_query_valid_columns&#039;} filter for the list of accepted values.
	 *                                Default &#039;post_date&#039;.
	 *         @type string $compare  Optional. The comparison operator. Accepts &#039;=&#039;, &#039;!=&#039;, &#039;&gt;&#039;, &#039;&gt;=&#039;, &#039;&lt;&#039;, &#039;&lt;=&#039;,
	 *                                &#039;IN&#039;, &#039;NOT IN&#039;, &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039;. Default &#039;=&#039;.
	 *         @type string $relation Optional. The boolean relationship between the date queries. Accepts &#039;OR&#039; or &#039;AND&#039;.
	 *                                Default &#039;OR&#039;.
	 *         @type array  ...$0 {
	 *             Optional. An array of first-order clause parameters, or another fully-formed date query.
	 *
	 *             @type string|array $before {
	 *                 Optional. Date to retrieve posts before. Accepts `strtotime()`-compatible string,
	 *                 or array of &#039;year&#039;, &#039;month&#039;, &#039;day&#039; values.
	 *
	 *                 @type string $year  The four-digit year. Default empty. Accepts any four-digit year.
	 *                 @type string $month Optional when passing array.The month of the year.
	 *                                     Default (string:empty)|(array:1). Accepts numbers 1-12.
	 *                 @type string $day   Optional when passing array.The day of the month.
	 *                                     Default (string:empty)|(array:1). Accepts numbers 1-31.
	 *             }
	 *             @type string|array $after {
	 *                 Optional. Date to retrieve posts after. Accepts `strtotime()`-compatible string,
	 *                 or array of &#039;year&#039;, &#039;month&#039;, &#039;day&#039; values.
	 *
	 *                 @type string $year  The four-digit year. Accepts any four-digit year. Default empty.
	 *                 @type string $month Optional when passing array. The month of the year. Accepts numbers 1-12.
	 *                                     Default (string:empty)|(array:12).
	 *                 @type string $day   Optional when passing array.The day of the month. Accepts numbers 1-31.
	 *                                     Default (string:empty)|(array:last day of month).
	 *             }
	 *             @type string       $column        Optional. Used to add a clause comparing a column other than
	 *                                               the column specified in the top-level `$column` parameter.
	 *                                               See WP_Date_Query::validate_column() and
	 *                                               the {@see &#039;date_query_valid_columns&#039;} filter for the list
	 *                                               of accepted values. Default is the value of top-level `$column`.
	 *             @type string       $compare       Optional. The comparison operator. Accepts &#039;=&#039;, &#039;!=&#039;, &#039;&gt;&#039;, &#039;&gt;=&#039;,
	 *                                               &#039;&lt;&#039;, &#039;&lt;=&#039;, &#039;IN&#039;, &#039;NOT IN&#039;, &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039;. &#039;IN&#039;,
	 *                                               &#039;NOT IN&#039;, &#039;BETWEEN&#039;, and &#039;NOT BETWEEN&#039;. Comparisons support
	 *                                               arrays in some time-related parameters. Default &#039;=&#039;.
	 *             @type bool         $inclusive     Optional. Include results from dates specified in &#039;before&#039; or
	 *                                               &#039;after&#039;. Default false.
	 *             @type int|int[]    $year          Optional. The four-digit year number. Accepts any four-digit year
	 *                                               or an array of years if `$compare` supports it. Default empty.
	 *             @type int|int[]    $month         Optional. The two-digit month number. Accepts numbers 1-12 or an
	 *                                               array of valid numbers if `$compare` supports it. Default empty.
	 *             @type int|int[]    $week          Optional. The week number of the year. Accepts numbers 0-53 or an
	 *                                               array of valid numbers if `$compare` supports it. Default empty.
	 *             @type int|int[]    $dayofyear     Optional. The day number of the year. Accepts numbers 1-366 or an
	 *                                               array of valid numbers if `$compare` supports it.
	 *             @type int|int[]    $day           Optional. The day of the month. Accepts numbers 1-31 or an array
	 *                                               of valid numbers if `$compare` supports it. Default empty.
	 *             @type int|int[]    $dayofweek     Optional. The day number of the week. Accepts numbers 1-7 (1 is
	 *                                               Sunday) or an array of valid numbers if `$compare` supports it.
	 *                                               Default empty.
	 *             @type int|int[]    $dayofweek_iso Optional. The day number of the week (ISO). Accepts numbers 1-7
	 *                                               (1 is Monday) or an array of valid numbers if `$compare` supports it.
	 *                                               Default empty.
	 *             @type int|int[]    $hour          Optional. The hour of the day. Accepts numbers 0-23 or an array
	 *                                               of valid numbers if `$compare` supports it. Default empty.
	 *             @type int|int[]    $minute        Optional. The minute of the hour. Accepts numbers 0-59 or an array
	 *                                               of valid numbers if `$compare` supports it. Default empty.
	 *             @type int|int[]    $second        Optional. The second of the minute. Accepts numbers 0-59 or an
	 *                                               array of valid numbers if `$compare` supports it. Default empty.
	 *         }
	 *     }
	 * }
	 * @param string $default_column Optional. Default column to query against. See WP_Date_Query::validate_column()
	 *                               and the {@see &#039;date_query_valid_columns&#039;} filter for the list of accepted values.
	 *                               Default &#039;post_date&#039;.
	 */
	public function __construct( $date_query, $default_column = &#039;post_date&#039; ) {
		if ( empty( $date_query ) || ! is_array( $date_query ) ) {
			return;
		}

		if ( isset( $date_query[&#039;relation&#039;] ) ) {
			$this-&gt;relation = $this-&gt;sanitize_relation( $date_query[&#039;relation&#039;] );
		} else {
			$this-&gt;relation = &#039;AND&#039;;
		}

		// Support for passing time-based keys in the top level of the $date_query array.
		if ( ! isset( $date_query[0] ) ) {
			$date_query = array( $date_query );
		}

		if ( ! empty( $date_query[&#039;column&#039;] ) ) {
			$date_query[&#039;column&#039;] = esc_sql( $date_query[&#039;column&#039;] );
		} else {
			$date_query[&#039;column&#039;] = esc_sql( $default_column );
		}

		$this-&gt;column = $this-&gt;validate_column( $this-&gt;column );

		$this-&gt;compare = $this-&gt;get_compare( $date_query );

		$this-&gt;queries = $this-&gt;sanitize_query( $date_query );
	}

	/**
	 * Recursive-friendly query sanitizer.
	 *
	 * Ensures that each query-level clause has a &#039;relation&#039; key, and that
	 * each first-order clause contains all the necessary keys from `$defaults`.
	 *
	 * @since 4.1.0
	 *
	 * @param array $queries
	 * @param array $parent_query
	 * @return array Sanitized queries.
	 */
	public function sanitize_query( $queries, $parent_query = null ) {
		$cleaned_query = array();

		$defaults = array(
			&#039;column&#039;   =&gt; &#039;post_date&#039;,
			&#039;compare&#039;  =&gt; &#039;=&#039;,
			&#039;relation&#039; =&gt; &#039;AND&#039;,
		);

		// Numeric keys should always have array values.
		foreach ( $queries as $qkey =&gt; $qvalue ) {
			if ( is_numeric( $qkey ) &amp;&amp; ! is_array( $qvalue ) ) {
				unset( $queries[ $qkey ] );
			}
		}

		// Each query should have a value for each default key. Inherit from the parent when possible.
		foreach ( $defaults as $dkey =&gt; $dvalue ) {
			if ( isset( $queries[ $dkey ] ) ) {
				continue;
			}

			if ( isset( $parent_query[ $dkey ] ) ) {
				$queries[ $dkey ] = $parent_query[ $dkey ];
			} else {
				$queries[ $dkey ] = $dvalue;
			}
		}

		// Validate the dates passed in the query.
		if ( $this-&gt;is_first_order_clause( $queries ) ) {
			$this-&gt;validate_date_values( $queries );
		}

		// Sanitize the relation parameter.
		$queries[&#039;relation&#039;] = $this-&gt;sanitize_relation( $queries[&#039;relation&#039;] );

		foreach ( $queries as $key =&gt; $q ) {
			if ( ! is_array( $q ) || in_array( $key, $this-&gt;time_keys, true ) ) {
				// This is a first-order query. Trust the values and sanitize when building SQL.
				$cleaned_query[ $key ] = $q;
			} else {
				// Any array without a time key is another query, so we recurse.
				$cleaned_query[] = $this-&gt;sanitize_query( $q, $queries );
			}
		}

		return $cleaned_query;
	}

	/**
	 * Determines whether this is a first-order clause.
	 *
	 * Checks to see if the current clause has any time-related keys.
	 * If so, it&#039;s first-order.
	 *
	 * @since 4.1.0
	 *
	 * @param array $query Query clause.
	 * @return bool True if this is a first-order clause.
	 */
	protected function is_first_order_clause( $query ) {
		$time_keys = array_intersect( $this-&gt;time_keys, array_keys( $query ) );
		return ! empty( $time_keys );
	}

	/**
	 * Determines and validates what comparison operator to use.
	 *
	 * @since 3.7.0
	 *
	 * @param array $query A date query or a date subquery.
	 * @return string The comparison operator.
	 */
	public function get_compare( $query ) {
		if ( ! empty( $query[&#039;compare&#039;] )
			&amp;&amp; in_array( $query[&#039;compare&#039;], array( &#039;=&#039;, &#039;!=&#039;, &#039;&gt;&#039;, &#039;&gt;=&#039;, &#039;&lt;&#039;, &#039;&lt;=&#039;, &#039;IN&#039;, &#039;NOT IN&#039;, &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039; ), true )
		) {
			return strtoupper( $query[&#039;compare&#039;] );
		}

		return $this-&gt;compare;
	}

	/**
	 * Validates the given date_query values and triggers errors if something is not valid.
	 *
	 * Note that date queries with invalid date ranges are allowed to
	 * continue (though of course no items will be found for impossible dates).
	 * This method only generates debug notices for these cases.
	 *
	 * @since 4.1.0
	 *
	 * @param array $date_query The date_query array.
	 * @return bool True if all values in the query are valid, false if one or more fail.
	 */
	public function validate_date_values( $date_query = array() ) {
		if ( empty( $date_query ) ) {
			return false;
		}

		$valid = true;

		/*
		 * Validate &#039;before&#039; and &#039;after&#039; up front, then let the
		 * validation routine continue to be sure that all invalid
		 * values generate errors too.
		 */
		if ( array_key_exists( &#039;before&#039;, $date_query ) &amp;&amp; is_array( $date_query[&#039;before&#039;] ) ) {
			$valid = $this-&gt;validate_date_values( $date_query[&#039;before&#039;] );
		}

		if ( array_key_exists( &#039;after&#039;, $date_query ) &amp;&amp; is_array( $date_query[&#039;after&#039;] ) ) {
			$valid = $this-&gt;validate_date_values( $date_query[&#039;after&#039;] );
		}

		// Array containing all min-max checks.
		$min_max_checks = array();

		// Days per year.
		if ( array_key_exists( &#039;year&#039;, $date_query ) ) {
			/*
			 * If a year exists in the date query, we can use it to get the days.
			 * If multiple years are provided (as in a BETWEEN), use the first one.
			 */
			if ( is_array( $date_query[&#039;year&#039;] ) ) {
				$_year = reset( $date_query[&#039;year&#039;] );
			} else {
				$_year = $date_query[&#039;year&#039;];
			}

			$max_days_of_year = (int) gmdate( &#039;z&#039;, mktime( 0, 0, 0, 12, 31, $_year ) ) + 1;
		} else {
			// Otherwise we use the max of 366 (leap-year).
			$max_days_of_year = 366;
		}

		$min_max_checks[&#039;dayofyear&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; $max_days_of_year,
		);

		// Days per week.
		$min_max_checks[&#039;dayofweek&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; 7,
		);

		// Days per week.
		$min_max_checks[&#039;dayofweek_iso&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; 7,
		);

		// Months per year.
		$min_max_checks[&#039;month&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; 12,
		);

		// Weeks per year.
		if ( isset( $_year ) ) {
			/*
			 * If we have a specific year, use it to calculate number of weeks.
			 * Note: the number of weeks in a year is the date in which Dec 28 appears.
			 */
			$week_count = gmdate( &#039;W&#039;, mktime( 0, 0, 0, 12, 28, $_year ) );

		} else {
			// Otherwise set the week-count to a maximum of 53.
			$week_count = 53;
		}

		$min_max_checks[&#039;week&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; $week_count,
		);

		// Days per month.
		$min_max_checks[&#039;day&#039;] = array(
			&#039;min&#039; =&gt; 1,
			&#039;max&#039; =&gt; 31,
		);

		// Hours per day.
		$min_max_checks[&#039;hour&#039;] = array(
			&#039;min&#039; =&gt; 0,
			&#039;max&#039; =&gt; 23,
		);

		// Minutes per hour.
		$min_max_checks[&#039;minute&#039;] = array(
			&#039;min&#039; =&gt; 0,
			&#039;max&#039; =&gt; 59,
		);

		// Seconds per minute.
		$min_max_checks[&#039;second&#039;] = array(
			&#039;min&#039; =&gt; 0,
			&#039;max&#039; =&gt; 59,
		);

		// Concatenate and throw a notice for each invalid value.
		foreach ( $min_max_checks as $key =&gt; $check ) {
			if ( ! array_key_exists( $key, $date_query ) ) {
				continue;
			}

			// Throw a notice for each failing value.
			foreach ( (array) $date_query[ $key ] as $_value ) {
				$is_between = $_value &gt;= $check[&#039;min&#039;] &amp;&amp; $_value &lt;= $check[&#039;max&#039;];

				if ( ! is_numeric( $_value ) || ! $is_between ) {
					$error = sprintf(
						/* translators: Date query invalid date message. 1: Invalid value, 2: Type of value, 3: Minimum valid value, 4: Maximum valid value. */
						__( &#039;Invalid value %1$s for %2$s. Expected value should be between %3$s and %4$s.&#039; ),
						&#039;&lt;code&gt;&#039; . esc_html( $_value ) . &#039;&lt;/code&gt;&#039;,
						&#039;&lt;code&gt;&#039; . esc_html( $key ) . &#039;&lt;/code&gt;&#039;,
						&#039;&lt;code&gt;&#039; . esc_html( $check[&#039;min&#039;] ) . &#039;&lt;/code&gt;&#039;,
						&#039;&lt;code&gt;&#039; . esc_html( $check[&#039;max&#039;] ) . &#039;&lt;/code&gt;&#039;
					);

					_doing_it_wrong( __CLASS__, $error, &#039;4.1.0&#039; );

					$valid = false;
				}
			}
		}

		// If we already have invalid date messages, don&#039;t bother running through checkdate().
		if ( ! $valid ) {
			return $valid;
		}

		$day_month_year_error_msg = &#039;&#039;;

		$day_exists   = array_key_exists( &#039;day&#039;, $date_query ) &amp;&amp; is_numeric( $date_query[&#039;day&#039;] );
		$month_exists = array_key_exists( &#039;month&#039;, $date_query ) &amp;&amp; is_numeric( $date_query[&#039;month&#039;] );
		$year_exists  = array_key_exists( &#039;year&#039;, $date_query ) &amp;&amp; is_numeric( $date_query[&#039;year&#039;] );

		if ( $day_exists &amp;&amp; $month_exists &amp;&amp; $year_exists ) {
			// 1. Checking day, month, year combination.
			if ( ! wp_checkdate( $date_query[&#039;month&#039;], $date_query[&#039;day&#039;], $date_query[&#039;year&#039;], sprintf( &#039;%s-%s-%s&#039;, $date_query[&#039;year&#039;], $date_query[&#039;month&#039;], $date_query[&#039;day&#039;] ) ) ) {
				$day_month_year_error_msg = sprintf(
					/* translators: 1: Year, 2: Month, 3: Day of month. */
					__( &#039;The following values do not describe a valid date: year %1$s, month %2$s, day %3$s.&#039; ),
					&#039;&lt;code&gt;&#039; . esc_html( $date_query[&#039;year&#039;] ) . &#039;&lt;/code&gt;&#039;,
					&#039;&lt;code&gt;&#039; . esc_html( $date_query[&#039;month&#039;] ) . &#039;&lt;/code&gt;&#039;,
					&#039;&lt;code&gt;&#039; . esc_html( $date_query[&#039;day&#039;] ) . &#039;&lt;/code&gt;&#039;
				);

				$valid = false;
			}
		} elseif ( $day_exists &amp;&amp; $month_exists ) {
			/*
			 * 2. checking day, month combination
			 * We use 2012 because, as a leap year, it&#039;s the most permissive.
			 */
			if ( ! wp_checkdate( $date_query[&#039;month&#039;], $date_query[&#039;day&#039;], 2012, sprintf( &#039;2012-%s-%s&#039;, $date_query[&#039;month&#039;], $date_query[&#039;day&#039;] ) ) ) {
				$day_month_year_error_msg = sprintf(
					/* translators: 1: Month, 2: Day of month. */
					__( &#039;The following values do not describe a valid date: month %1$s, day %2$s.&#039; ),
					&#039;&lt;code&gt;&#039; . esc_html( $date_query[&#039;month&#039;] ) . &#039;&lt;/code&gt;&#039;,
					&#039;&lt;code&gt;&#039; . esc_html( $date_query[&#039;day&#039;] ) . &#039;&lt;/code&gt;&#039;
				);

				$valid = false;
			}
		}

		if ( ! empty( $day_month_year_error_msg ) ) {
			_doing_it_wrong( __CLASS__, $day_month_year_error_msg, &#039;4.1.0&#039; );
		}

		return $valid;
	}

	/**
	 * Validates a column name parameter.
	 *
	 * Column names without a table prefix (like &#039;post_date&#039;) are checked against a list of
	 * allowed and known tables, and then, if found, have a table prefix (such as &#039;wp_posts.&#039;)
	 * prepended. Prefixed column names (such as &#039;wp_posts.post_date&#039;) bypass this allowed
	 * check, and are only sanitized to remove illegal characters.
	 *
	 * @since 3.7.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $column The user-supplied column name.
	 * @return string A validated column name value.
	 */
	public function validate_column( $column ) {
		global $wpdb;

		$valid_columns = array(
			&#039;post_date&#039;,         // Part of $wpdb-&gt;posts.
			&#039;post_date_gmt&#039;,     // Part of $wpdb-&gt;posts.
			&#039;post_modified&#039;,     // Part of $wpdb-&gt;posts.
			&#039;post_modified_gmt&#039;, // Part of $wpdb-&gt;posts.
			&#039;comment_date&#039;,      // Part of $wpdb-&gt;comments.
			&#039;comment_date_gmt&#039;,  // Part of $wpdb-&gt;comments.
			&#039;user_registered&#039;,   // Part of $wpdb-&gt;users.
		);

		if ( is_multisite() ) {
			$valid_columns = array_merge(
				$valid_columns,
				array(
					&#039;registered&#039;,   // Part of $wpdb-&gt;blogs.
					&#039;last_updated&#039;, // Part of $wpdb-&gt;blogs.
				)
			);
		}

		// Attempt to detect a table prefix.
		if ( ! str_contains( $column, &#039;.&#039; ) ) {
			/**
			 * Filters the list of valid date query columns.
			 *
			 * @since 3.7.0
			 * @since 4.1.0 Added &#039;user_registered&#039; to the default recognized columns.
			 * @since 4.6.0 Added &#039;registered&#039; and &#039;last_updated&#039; to the default recognized columns.
			 *
			 * @param string[] $valid_columns An array of valid date query columns. Defaults
			 *                                are &#039;post_date&#039;, &#039;post_date_gmt&#039;, &#039;post_modified&#039;,
			 *                                &#039;post_modified_gmt&#039;, &#039;comment_date&#039;, &#039;comment_date_gmt&#039;,
			 *                                &#039;user_registered&#039;, &#039;registered&#039;, &#039;last_updated&#039;.
			 */
			if ( ! in_array( $column, apply_filters( &#039;date_query_valid_columns&#039;, $valid_columns ), true ) ) {
				$column = &#039;post_date&#039;;
			}

			$known_columns = array(
				$wpdb-&gt;posts    =&gt; array(
					&#039;post_date&#039;,
					&#039;post_date_gmt&#039;,
					&#039;post_modified&#039;,
					&#039;post_modified_gmt&#039;,
				),
				$wpdb-&gt;comments =&gt; array(
					&#039;comment_date&#039;,
					&#039;comment_date_gmt&#039;,
				),
				$wpdb-&gt;users    =&gt; array(
					&#039;user_registered&#039;,
				),
			);

			if ( is_multisite() ) {
				$known_columns[ $wpdb-&gt;blogs ] = array(
					&#039;registered&#039;,
					&#039;last_updated&#039;,
				);
			}

			// If it&#039;s a known column name, add the appropriate table prefix.
			foreach ( $known_columns as $table_name =&gt; $table_columns ) {
				if ( in_array( $column, $table_columns, true ) ) {
					$column = $table_name . &#039;.&#039; . $column;
					break;
				}
			}
		}

		// Remove unsafe characters.
		return preg_replace( &#039;/[^a-zA-Z0-9_$\.]/&#039;, &#039;&#039;, $column );
	}

	/**
	 * Generates WHERE clause to be appended to a main query.
	 *
	 * @since 3.7.0
	 *
	 * @return string MySQL WHERE clause.
	 */
	public function get_sql() {
		$sql = $this-&gt;get_sql_clauses();

		$where = $sql[&#039;where&#039;];

		/**
		 * Filters the date query WHERE clause.
		 *
		 * @since 3.7.0
		 *
		 * @param string        $where WHERE clause of the date query.
		 * @param WP_Date_Query $query The WP_Date_Query instance.
		 */
		return apply_filters( &#039;get_date_sql&#039;, $where, $this );
	}

	/**
	 * Generates SQL clauses to be appended to a main query.
	 *
	 * Called by the public WP_Date_Query::get_sql(), this method is abstracted
	 * out to maintain parity with the other Query classes.
	 *
	 * @since 4.1.0
	 *
	 * @return string[] {
	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.
	 *
	 *     @type string $join  SQL fragment to append to the main JOIN clause.
	 *     @type string $where SQL fragment to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_clauses() {
		$sql = $this-&gt;get_sql_for_query( $this-&gt;queries );

		if ( ! empty( $sql[&#039;where&#039;] ) ) {
			$sql[&#039;where&#039;] = &#039; AND &#039; . $sql[&#039;where&#039;];
		}

		return $sql;
	}

	/**
	 * Generates SQL clauses for a single query array.
	 *
	 * If nested subqueries are found, this method recurses the tree to
	 * produce the properly nested SQL.
	 *
	 * @since 4.1.0
	 *
	 * @param array $query Query to parse.
	 * @param int   $depth Optional. Number of tree levels deep we currently are.
	 *                     Used to calculate indentation. Default 0.
	 * @return array {
	 *     Array containing JOIN and WHERE SQL clauses to append to a single query array.
	 *
	 *     @type string $join  SQL fragment to append to the main JOIN clause.
	 *     @type string $where SQL fragment to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_for_query( $query, $depth = 0 ) {
		$sql_chunks = array(
			&#039;join&#039;  =&gt; array(),
			&#039;where&#039; =&gt; array(),
		);

		$sql = array(
			&#039;join&#039;  =&gt; &#039;&#039;,
			&#039;where&#039; =&gt; &#039;&#039;,
		);

		$indent = &#039;&#039;;
		for ( $i = 0; $i &lt; $depth; $i++ ) {
			$indent .= &#039;  &#039;;
		}

		foreach ( $query as $key =&gt; $clause ) {
			if ( &#039;relation&#039; === $key ) {
				$relation = $query[&#039;relation&#039;];
			} elseif ( is_array( $clause ) ) {

				// This is a first-order clause.
				if ( $this-&gt;is_first_order_clause( $clause ) ) {
					$clause_sql = $this-&gt;get_sql_for_clause( $clause, $query );

					$where_count = count( $clause_sql[&#039;where&#039;] );
					if ( ! $where_count ) {
						$sql_chunks[&#039;where&#039;][] = &#039;&#039;;
					} elseif ( 1 === $where_count ) {
						$sql_chunks[&#039;where&#039;][] = $clause_sql[&#039;where&#039;][0];
					} else {
						$sql_chunks[&#039;where&#039;][] = &#039;( &#039; . implode( &#039; AND &#039;, $clause_sql[&#039;where&#039;] ) . &#039; )&#039;;
					}

					$sql_chunks[&#039;join&#039;] = array_merge( $sql_chunks[&#039;join&#039;], $clause_sql[&#039;join&#039;] );
					// This is a subquery, so we recurse.
				} else {
					$clause_sql = $this-&gt;get_sql_for_query( $clause, $depth + 1 );

					$sql_chunks[&#039;where&#039;][] = $clause_sql[&#039;where&#039;];
					$sql_chunks[&#039;join&#039;][]  = $clause_sql[&#039;join&#039;];
				}
			}
		}

		// Filter to remove empties.
		$sql_chunks[&#039;join&#039;]  = array_filter( $sql_chunks[&#039;join&#039;] );
		$sql_chunks[&#039;where&#039;] = array_filter( $sql_chunks[&#039;where&#039;] );

		if ( empty( $relation ) ) {
			$relation = &#039;AND&#039;;
		}

		// Filter duplicate JOIN clauses and combine into a single string.
		if ( ! empty( $sql_chunks[&#039;join&#039;] ) ) {
			$sql[&#039;join&#039;] = implode( &#039; &#039;, array_unique( $sql_chunks[&#039;join&#039;] ) );
		}

		// Generate a single WHERE clause with proper brackets and indentation.
		if ( ! empty( $sql_chunks[&#039;where&#039;] ) ) {
			$sql[&#039;where&#039;] = &#039;( &#039; . &quot;\n  &quot; . $indent . implode( &#039; &#039; . &quot;\n  &quot; . $indent . $relation . &#039; &#039; . &quot;\n  &quot; . $indent, $sql_chunks[&#039;where&#039;] ) . &quot;\n&quot; . $indent . &#039;)&#039;;
		}

		return $sql;
	}

	/**
	 * Turns a single date clause into pieces for a WHERE clause.
	 *
	 * A wrapper for get_sql_for_clause(), included here for backward
	 * compatibility while retaining the naming convention across Query classes.
	 *
	 * @since 3.7.0
	 *
	 * @param array $query Date query arguments.
	 * @return array {
	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.
	 *
	 *     @type string[] $join  Array of SQL fragments to append to the main JOIN clause.
	 *     @type string[] $where Array of SQL fragments to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_for_subquery( $query ) {
		return $this-&gt;get_sql_for_clause( $query, &#039;&#039; );
	}

	/**
	 * Turns a first-order date query into SQL for a WHERE clause.
	 *
	 * @since 4.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param array $query        Date query clause.
	 * @param array $parent_query Parent query of the current date query.
	 * @return array {
	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.
	 *
	 *     @type string[] $join  Array of SQL fragments to append to the main JOIN clause.
	 *     @type string[] $where Array of SQL fragments to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_for_clause( $query, $parent_query ) {
		global $wpdb;

		// The sub-parts of a $where part.
		$where_parts = array();

		$column = ( ! empty( $query[&#039;column&#039;] ) ) ? esc_sql( $query[&#039;column&#039;] ) : $this-&gt;column;

		$column = $this-&gt;validate_column( $column );

		$compare = $this-&gt;get_compare( $query );

		$inclusive = ! empty( $query[&#039;inclusive&#039;] );

		// Assign greater- and less-than values.
		$lt = &#039;&lt;&#039;;
		$gt = &#039;&gt;&#039;;

		if ( $inclusive ) {
			$lt .= &#039;=&#039;;
			$gt .= &#039;=&#039;;
		}

		// Range queries.
		if ( ! empty( $query[&#039;after&#039;] ) ) {
			$where_parts[] = $wpdb-&gt;prepare( &quot;$column $gt %s&quot;, $this-&gt;build_mysql_datetime( $query[&#039;after&#039;], ! $inclusive ) );
		}
		if ( ! empty( $query[&#039;before&#039;] ) ) {
			$where_parts[] = $wpdb-&gt;prepare( &quot;$column $lt %s&quot;, $this-&gt;build_mysql_datetime( $query[&#039;before&#039;], $inclusive ) );
		}
		// Specific value queries.

		$date_units = array(
			&#039;YEAR&#039;           =&gt; array( &#039;year&#039; ),
			&#039;MONTH&#039;          =&gt; array( &#039;month&#039;, &#039;monthnum&#039; ),
			&#039;_wp_mysql_week&#039; =&gt; array( &#039;week&#039;, &#039;w&#039; ),
			&#039;DAYOFYEAR&#039;      =&gt; array( &#039;dayofyear&#039; ),
			&#039;DAYOFMONTH&#039;     =&gt; array( &#039;day&#039; ),
			&#039;DAYOFWEEK&#039;      =&gt; array( &#039;dayofweek&#039; ),
			&#039;WEEKDAY&#039;        =&gt; array( &#039;dayofweek_iso&#039; ),
		);

		// Check of the possible date units and add them to the query.
		foreach ( $date_units as $sql_part =&gt; $query_parts ) {
			foreach ( $query_parts as $query_part ) {
				if ( isset( $query[ $query_part ] ) ) {
					$value = $this-&gt;build_value( $compare, $query[ $query_part ] );
					if ( $value ) {
						switch ( $sql_part ) {
							case &#039;_wp_mysql_week&#039;:
								$where_parts[] = _wp_mysql_week( $column ) . &quot; $compare $value&quot;;
								break;
							case &#039;WEEKDAY&#039;:
								$where_parts[] = &quot;$sql_part( $column ) + 1 $compare $value&quot;;
								break;
							default:
								$where_parts[] = &quot;$sql_part( $column ) $compare $value&quot;;
						}

						break;
					}
				}
			}
		}

		if ( isset( $query[&#039;hour&#039;] ) || isset( $query[&#039;minute&#039;] ) || isset( $query[&#039;second&#039;] ) ) {
			// Avoid notices.
			foreach ( array( &#039;hour&#039;, &#039;minute&#039;, &#039;second&#039; ) as $unit ) {
				if ( ! isset( $query[ $unit ] ) ) {
					$query[ $unit ] = null;
				}
			}

			$time_query = $this-&gt;build_time_query( $column, $compare, $query[&#039;hour&#039;], $query[&#039;minute&#039;], $query[&#039;second&#039;] );
			if ( $time_query ) {
				$where_parts[] = $time_query;
			}
		}

		/*
		 * Return an array of &#039;join&#039; and &#039;where&#039; for compatibility
		 * with other query classes.
		 */
		return array(
			&#039;where&#039; =&gt; $where_parts,
			&#039;join&#039;  =&gt; array(),
		);
	}

	/**
	 * Builds and validates a value string based on the comparison operator.
	 *
	 * @since 3.7.0
	 *
	 * @param string       $compare The compare operator to use.
	 * @param string|array $value   The value.
	 * @return string|false|int The value to be used in SQL or false on error.
	 */
	public function build_value( $compare, $value ) {
		if ( ! isset( $value ) ) {
			return false;
		}

		switch ( $compare ) {
			case &#039;IN&#039;:
			case &#039;NOT IN&#039;:
				$value = (array) $value;

				// Remove non-numeric values.
				$value = array_filter( $value, &#039;is_numeric&#039; );

				if ( empty( $value ) ) {
					return false;
				}

				return &#039;(&#039; . implode( &#039;,&#039;, array_map( &#039;intval&#039;, $value ) ) . &#039;)&#039;;

			case &#039;BETWEEN&#039;:
			case &#039;NOT BETWEEN&#039;:
				if ( ! is_array( $value ) || 2 !== count( $value ) ) {
					$value = array( $value, $value );
				} else {
					$value = array_values( $value );
				}

				// If either value is non-numeric, bail.
				foreach ( $value as $v ) {
					if ( ! is_numeric( $v ) ) {
						return false;
					}
				}

				$value = array_map( &#039;intval&#039;, $value );

				return $value[0] . &#039; AND &#039; . $value[1];

			default:
				if ( ! is_numeric( $value ) ) {
					return false;
				}

				return (int) $value;
		}
	}

	/**
	 * Builds a MySQL format date/time based on some query parameters.
	 *
	 * You can pass an array of values (year, month, etc.) with missing parameter values being defaulted to
	 * either the maximum or minimum values (controlled by the $default_to parameter). Alternatively you can
	 * pass a string that will be passed to date_create().
	 *
	 * @since 3.7.0
	 *
	 * @param string|array $datetime       An array of parameters or a strtotime() string.
	 * @param bool         $default_to_max Whether to round up incomplete dates. Supported by values
	 *                                     of $datetime that are arrays, or string values that are a
	 *                                     subset of MySQL date format (&#039;Y&#039;, &#039;Y-m&#039;, &#039;Y-m-d&#039;, &#039;Y-m-d H:i&#039;).
	 *                                     Default: false.
	 * @return string|false A MySQL format date/time or false on failure.
	 */
	public function build_mysql_datetime( $datetime, $default_to_max = false ) {
		if ( ! is_array( $datetime ) ) {

			/*
			 * Try to parse some common date formats, so we can detect
			 * the level of precision and support the &#039;inclusive&#039; parameter.
			 */
			if ( preg_match( &#039;/^(\d{4})$/&#039;, $datetime, $matches ) ) {
				// Y
				$datetime = array(
					&#039;year&#039; =&gt; (int) $matches[1],
				);

			} elseif ( preg_match( &#039;/^(\d{4})\-(\d{2})$/&#039;, $datetime, $matches ) ) {
				// Y-m
				$datetime = array(
					&#039;year&#039;  =&gt; (int) $matches[1],
					&#039;month&#039; =&gt; (int) $matches[2],
				);

			} elseif ( preg_match( &#039;/^(\d{4})\-(\d{2})\-(\d{2})$/&#039;, $datetime, $matches ) ) {
				// Y-m-d
				$datetime = array(
					&#039;year&#039;  =&gt; (int) $matches[1],
					&#039;month&#039; =&gt; (int) $matches[2],
					&#039;day&#039;   =&gt; (int) $matches[3],
				);

			} elseif ( preg_match( &#039;/^(\d{4})\-(\d{2})\-(\d{2}) (\d{2}):(\d{2})$/&#039;, $datetime, $matches ) ) {
				// Y-m-d H:i
				$datetime = array(
					&#039;year&#039;   =&gt; (int) $matches[1],
					&#039;month&#039;  =&gt; (int) $matches[2],
					&#039;day&#039;    =&gt; (int) $matches[3],
					&#039;hour&#039;   =&gt; (int) $matches[4],
					&#039;minute&#039; =&gt; (int) $matches[5],
				);
			}

			// If no match is found, we don&#039;t support default_to_max.
			if ( ! is_array( $datetime ) ) {
				$wp_timezone = wp_timezone();

				// Assume local timezone if not provided.
				$dt = date_create( $datetime, $wp_timezone );

				if ( false === $dt ) {
					return gmdate( &#039;Y-m-d H:i:s&#039;, false );
				}

				return $dt-&gt;setTimezone( $wp_timezone )-&gt;format( &#039;Y-m-d H:i:s&#039; );
			}
		}

		$datetime = array_map( &#039;absint&#039;, $datetime );

		if ( ! isset( $datetime[&#039;year&#039;] ) ) {
			$datetime[&#039;year&#039;] = current_time( &#039;Y&#039; );
		}

		if ( ! isset( $datetime[&#039;month&#039;] ) ) {
			$datetime[&#039;month&#039;] = ( $default_to_max ) ? 12 : 1;
		}

		if ( ! isset( $datetime[&#039;day&#039;] ) ) {
			$datetime[&#039;day&#039;] = ( $default_to_max ) ? (int) gmdate( &#039;t&#039;, mktime( 0, 0, 0, $datetime[&#039;month&#039;], 1, $datetime[&#039;year&#039;] ) ) : 1;
		}

		if ( ! isset( $datetime[&#039;hour&#039;] ) ) {
			$datetime[&#039;hour&#039;] = ( $default_to_max ) ? 23 : 0;
		}

		if ( ! isset( $datetime[&#039;minute&#039;] ) ) {
			$datetime[&#039;minute&#039;] = ( $default_to_max ) ? 59 : 0;
		}

		if ( ! isset( $datetime[&#039;second&#039;] ) ) {
			$datetime[&#039;second&#039;] = ( $default_to_max ) ? 59 : 0;
		}

		return sprintf( &#039;%04d-%02d-%02d %02d:%02d:%02d&#039;, $datetime[&#039;year&#039;], $datetime[&#039;month&#039;], $datetime[&#039;day&#039;], $datetime[&#039;hour&#039;], $datetime[&#039;minute&#039;], $datetime[&#039;second&#039;] );
	}

	/**
	 * Builds a query string for comparing time values (hour, minute, second).
	 *
	 * If just hour, minute, or second is set than a normal comparison will be done.
	 * However if multiple values are passed, a pseudo-decimal time will be created
	 * in order to be able to accurately compare against.
	 *
	 * @since 3.7.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string   $column  The column to query against. Needs to be pre-validated!
	 * @param string   $compare The comparison operator. Needs to be pre-validated!
	 * @param int|null $hour    Optional. An hour value (0-23).
	 * @param int|null $minute  Optional. A minute value (0-59).
	 * @param int|null $second  Optional. A second value (0-59).
	 * @return string|false A query part or false on failure.
	 */
	public function build_time_query( $column, $compare, $hour = null, $minute = null, $second = null ) {
		global $wpdb;

		// Have to have at least one.
		if ( ! isset( $hour ) &amp;&amp; ! isset( $minute ) &amp;&amp; ! isset( $second ) ) {
			return false;
		}

		// Complex combined queries aren&#039;t supported for multi-value queries.
		if ( in_array( $compare, array( &#039;IN&#039;, &#039;NOT IN&#039;, &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039; ), true ) ) {
			$return = array();

			$value = $this-&gt;build_value( $compare, $hour );
			if ( false !== $value ) {
				$return[] = &quot;HOUR( $column ) $compare $value&quot;;
			}

			$value = $this-&gt;build_value( $compare, $minute );
			if ( false !== $value ) {
				$return[] = &quot;MINUTE( $column ) $compare $value&quot;;
			}

			$value = $this-&gt;build_value( $compare, $second );
			if ( false !== $value ) {
				$return[] = &quot;SECOND( $column ) $compare $value&quot;;
			}

			return implode( &#039; AND &#039;, $return );
		}

		// Cases where just one unit is set.
		if ( isset( $hour ) &amp;&amp; ! isset( $minute ) &amp;&amp; ! isset( $second ) ) {
			$value = $this-&gt;build_value( $compare, $hour );
			if ( false !== $value ) {
				return &quot;HOUR( $column ) $compare $value&quot;;
			}
		} elseif ( ! isset( $hour ) &amp;&amp; isset( $minute ) &amp;&amp; ! isset( $second ) ) {
			$value = $this-&gt;build_value( $compare, $minute );
			if ( false !== $value ) {
				return &quot;MINUTE( $column ) $compare $value&quot;;
			}
		} elseif ( ! isset( $hour ) &amp;&amp; ! isset( $minute ) &amp;&amp; isset( $second ) ) {
			$value = $this-&gt;build_value( $compare, $second );
			if ( false !== $value ) {
				return &quot;SECOND( $column ) $compare $value&quot;;
			}
		}

		// Single units were already handled. Since hour &amp; second isn&#039;t allowed, minute must to be set.
		if ( ! isset( $minute ) ) {
			return false;
		}

		$format = &#039;&#039;;
		$time   = &#039;&#039;;

		// Hour.
		if ( null !== $hour ) {
			$format .= &#039;%H.&#039;;
			$time   .= sprintf( &#039;%02d&#039;, $hour ) . &#039;.&#039;;
		} else {
			$format .= &#039;0.&#039;;
			$time   .= &#039;0.&#039;;
		}

		// Minute.
		$format .= &#039;%i&#039;;
		$time   .= sprintf( &#039;%02d&#039;, $minute );

		if ( isset( $second ) ) {
			$format .= &#039;%s&#039;;
			$time   .= sprintf( &#039;%02d&#039;, $second );
		}

		return $wpdb-&gt;prepare( &quot;DATE_FORMAT( $column, %s ) $compare %f&quot;, $format, $time );
	}

	/**
	 * Sanitizes a &#039;relation&#039; operator.
	 *
	 * @since 6.0.3
	 *
	 * @param string $relation Raw relation key from the query argument.
	 * @return string Sanitized relation. Either &#039;AND&#039; or &#039;OR&#039;.
	 */
	public function sanitize_relation( $relation ) {
		if ( &#039;OR&#039; === strtoupper( $relation ) ) {
			return &#039;OR&#039;;
		} else {
			return &#039;AND&#039;;
		}
	}
}
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