<h3>Düzenle: taxonomy.php</h3>
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/**
 * WordPress Taxonomy Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

//
// Category.
//

/**
 * Checks whether a category exists.
 *
 * @since 2.0.0
 *
 * @see term_exists()
 *
 * @param int|string $cat_name        Category name.
 * @param int        $category_parent Optional. ID of parent category.
 * @return string|null Returns the category ID as a numeric string if the pairing exists, null if not.
 */
function category_exists( $cat_name, $category_parent = null ) {
	$id = term_exists( $cat_name, &#039;category&#039;, $category_parent );
	if ( is_array( $id ) ) {
		$id = $id[&#039;term_id&#039;];
	}
	return $id;
}

/**
 * Gets category object for given ID and &#039;edit&#039; filter context.
 *
 * @since 2.0.0
 *
 * @param int $id
 * @return object
 */
function get_category_to_edit( $id ) {
	$category = get_term( $id, &#039;category&#039;, OBJECT, &#039;edit&#039; );
	_make_cat_compat( $category );
	return $category;
}

/**
 * Adds a new category to the database if it does not already exist.
 *
 * @since 2.0.0
 *
 * @param int|string $cat_name        Category name.
 * @param int        $category_parent Optional. ID of parent category.
 * @return int|WP_Error
 */
function wp_create_category( $cat_name, $category_parent = 0 ) {
	$id = category_exists( $cat_name, $category_parent );
	if ( $id ) {
		return $id;
	}

	return wp_insert_category(
		array(
			&#039;cat_name&#039;        =&gt; $cat_name,
			&#039;category_parent&#039; =&gt; $category_parent,
		)
	);
}

/**
 * Creates categories for the given post.
 *
 * @since 2.0.0
 *
 * @param string[] $categories Array of category names to create.
 * @param int      $post_id    Optional. The post ID. Default empty.
 * @return int[] Array of IDs of categories assigned to the given post.
 */
function wp_create_categories( $categories, $post_id = 0 ) {
	$cat_ids = array();
	foreach ( $categories as $category ) {
		$id = category_exists( $category );
		if ( $id ) {
			$cat_ids[] = $id;
		} else {
			$id = wp_create_category( $category );
			if ( $id ) {
				$cat_ids[] = $id;
			}
		}
	}

	if ( $post_id ) {
		wp_set_post_categories( $post_id, $cat_ids );
	}

	return $cat_ids;
}

/**
 * Updates an existing Category or creates a new Category.
 *
 * @since 2.0.0
 * @since 2.5.0 $wp_error parameter was added.
 * @since 3.0.0 The &#039;taxonomy&#039; argument was added.
 *
 * @param array $catarr {
 *     Array of arguments for inserting a new category.
 *
 *     @type int        $cat_ID               Category ID. A non-zero value updates an existing category.
 *                                            Default 0.
 *     @type string     $taxonomy             Taxonomy slug. Default &#039;category&#039;.
 *     @type string     $cat_name             Category name. Default empty.
 *     @type string     $category_description Category description. Default empty.
 *     @type string     $category_nicename    Category nice (display) name. Default empty.
 *     @type int|string $category_parent      Category parent ID. Default empty.
 * }
 * @param bool  $wp_error Optional. Default false.
 * @return int|WP_Error The ID number of the new or updated Category on success. Zero or a WP_Error on failure,
 *                      depending on param `$wp_error`.
 */
function wp_insert_category( $catarr, $wp_error = false ) {
	$cat_defaults = array(
		&#039;cat_ID&#039;               =&gt; 0,
		&#039;taxonomy&#039;             =&gt; &#039;category&#039;,
		&#039;cat_name&#039;             =&gt; &#039;&#039;,
		&#039;category_description&#039; =&gt; &#039;&#039;,
		&#039;category_nicename&#039;    =&gt; &#039;&#039;,
		&#039;category_parent&#039;      =&gt; &#039;&#039;,
	);
	$catarr       = wp_parse_args( $catarr, $cat_defaults );

	if ( &#039;&#039; === trim( $catarr[&#039;cat_name&#039;] ) ) {
		if ( ! $wp_error ) {
			return 0;
		} else {
			return new WP_Error( &#039;cat_name&#039;, __( &#039;You did not enter a category name.&#039; ) );
		}
	}

	$catarr[&#039;cat_ID&#039;] = (int) $catarr[&#039;cat_ID&#039;];

	// Are we updating or creating?
	$update = ! empty( $catarr[&#039;cat_ID&#039;] );

	$name        = $catarr[&#039;cat_name&#039;];
	$description = $catarr[&#039;category_description&#039;];
	$slug        = $catarr[&#039;category_nicename&#039;];
	$parent      = (int) $catarr[&#039;category_parent&#039;];
	if ( $parent &lt; 0 ) {
		$parent = 0;
	}

	if ( empty( $parent )
		|| ! term_exists( $parent, $catarr[&#039;taxonomy&#039;] )
		|| ( $catarr[&#039;cat_ID&#039;] &amp;&amp; term_is_ancestor_of( $catarr[&#039;cat_ID&#039;], $parent, $catarr[&#039;taxonomy&#039;] ) ) ) {
		$parent = 0;
	}

	$args = compact( &#039;name&#039;, &#039;slug&#039;, &#039;parent&#039;, &#039;description&#039; );

	if ( $update ) {
		$catarr[&#039;cat_ID&#039;] = wp_update_term( $catarr[&#039;cat_ID&#039;], $catarr[&#039;taxonomy&#039;], $args );
	} else {
		$catarr[&#039;cat_ID&#039;] = wp_insert_term( $catarr[&#039;cat_name&#039;], $catarr[&#039;taxonomy&#039;], $args );
	}

	if ( is_wp_error( $catarr[&#039;cat_ID&#039;] ) ) {
		if ( $wp_error ) {
			return $catarr[&#039;cat_ID&#039;];
		} else {
			return 0;
		}
	}
	return $catarr[&#039;cat_ID&#039;][&#039;term_id&#039;];
}

/**
 * Aliases wp_insert_category() with minimal args.
 *
 * If you want to update only some fields of an existing category, call this
 * function with only the new values set inside $catarr.
 *
 * @since 2.0.0
 *
 * @param array $catarr The &#039;cat_ID&#039; value is required. All other keys are optional.
 * @return int|false The ID number of the new or updated Category on success. Zero or FALSE on failure.
 */
function wp_update_category( $catarr ) {
	$cat_id = (int) $catarr[&#039;cat_ID&#039;];

	if ( isset( $catarr[&#039;category_parent&#039;] ) &amp;&amp; ( $cat_id === (int) $catarr[&#039;category_parent&#039;] ) ) {
		return false;
	}

	// First, get all of the original fields.
	$category = get_term( $cat_id, &#039;category&#039;, ARRAY_A );
	_make_cat_compat( $category );

	// Escape data pulled from DB.
	$category = wp_slash( $category );

	// Merge old and new fields with new fields overwriting old ones.
	$catarr = array_merge( $category, $catarr );

	return wp_insert_category( $catarr );
}

//
// Tags.
//

/**
 * Checks whether a post tag with a given name exists.
 *
 * @since 2.3.0
 *
 * @param int|string $tag_name
 * @return mixed Returns null if the term does not exist.
 *               Returns an array of the term ID and the term taxonomy ID if the pairing exists.
 *               Returns 0 if term ID 0 is passed to the function.
 */
function tag_exists( $tag_name ) {
	return term_exists( $tag_name, &#039;post_tag&#039; );
}

/**
 * Adds a new tag to the database if it does not already exist.
 *
 * @since 2.3.0
 *
 * @param int|string $tag_name
 * @return array|WP_Error
 */
function wp_create_tag( $tag_name ) {
	return wp_create_term( $tag_name, &#039;post_tag&#039; );
}

/**
 * Gets comma-separated list of tags available to edit.
 *
 * @since 2.3.0
 *
 * @param int    $post_id
 * @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default &#039;post_tag&#039;.
 * @return string|false|WP_Error
 */
function get_tags_to_edit( $post_id, $taxonomy = &#039;post_tag&#039; ) {
	return get_terms_to_edit( $post_id, $taxonomy );
}

/**
 * Gets comma-separated list of terms available to edit for the given post ID.
 *
 * @since 2.8.0
 *
 * @param int    $post_id
 * @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default &#039;post_tag&#039;.
 * @return string|false|WP_Error
 */
function get_terms_to_edit( $post_id, $taxonomy = &#039;post_tag&#039; ) {
	$post_id = (int) $post_id;
	if ( ! $post_id ) {
		return false;
	}

	$terms = get_object_term_cache( $post_id, $taxonomy );
	if ( false === $terms ) {
		$terms = wp_get_object_terms( $post_id, $taxonomy );
		wp_cache_add( $post_id, wp_list_pluck( $terms, &#039;term_id&#039; ), $taxonomy . &#039;_relationships&#039; );
	}

	if ( ! $terms ) {
		return false;
	}
	if ( is_wp_error( $terms ) ) {
		return $terms;
	}
	$term_names = array();
	foreach ( $terms as $term ) {
		$term_names[] = $term-&gt;name;
	}

	$terms_to_edit = esc_attr( implode( &#039;,&#039;, $term_names ) );

	/**
	 * Filters the comma-separated list of terms available to edit.
	 *
	 * @since 2.8.0
	 *
	 * @see get_terms_to_edit()
	 *
	 * @param string $terms_to_edit A comma-separated list of term names.
	 * @param string $taxonomy      The taxonomy name for which to retrieve terms.
	 */
	$terms_to_edit = apply_filters( &#039;terms_to_edit&#039;, $terms_to_edit, $taxonomy );

	return $terms_to_edit;
}

/**
 * Adds a new term to the database if it does not already exist.
 *
 * @since 2.8.0
 *
 * @param string $tag_name The term name.
 * @param string $taxonomy Optional. The taxonomy within which to create the term. Default &#039;post_tag&#039;.
 * @return array|WP_Error
 */
function wp_create_term( $tag_name, $taxonomy = &#039;post_tag&#039; ) {
	$id = term_exists( $tag_name, $taxonomy );
	if ( $id ) {
		return $id;
	}

	return wp_insert_term( $tag_name, $taxonomy );
}
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