<h3>Düzenle: class-file-upload-upgrader.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/**
 * Upgrade API: File_Upload_Upgrader class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Core class used for handling file uploads.
 *
 * This class handles the upload process and passes it as if it&#039;s a local file
 * to the Upgrade/Installer functions.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
 */
#[AllowDynamicProperties]
class File_Upload_Upgrader {

	/**
	 * The full path to the file package.
	 *
	 * @since 2.8.0
	 * @var string $package
	 */
	public $package;

	/**
	 * The name of the file.
	 *
	 * @since 2.8.0
	 * @var string $filename
	 */
	public $filename;

	/**
	 * The ID of the attachment post for this file.
	 *
	 * @since 3.3.0
	 * @var int $id
	 */
	public $id = 0;

	/**
	 * Construct the upgrader for a form.
	 *
	 * @since 2.8.0
	 *
	 * @param string $form      The name of the form the file was uploaded from.
	 * @param string $urlholder The name of the `GET` parameter that holds the filename.
	 */
	public function __construct( $form, $urlholder ) {

		if ( empty( $_FILES[ $form ][&#039;name&#039;] ) &amp;&amp; empty( $_GET[ $urlholder ] ) ) {
			wp_die( __( &#039;Please select a file&#039; ) );
		}

		// Handle a newly uploaded file. Else, assume it&#039;s already been uploaded.
		if ( ! empty( $_FILES ) ) {
			$overrides = array(
				&#039;test_form&#039; =&gt; false,
				&#039;test_type&#039; =&gt; false,
			);
			$file      = wp_handle_upload( $_FILES[ $form ], $overrides );

			if ( isset( $file[&#039;error&#039;] ) ) {
				wp_die( $file[&#039;error&#039;] );
			}

			if ( &#039;pluginzip&#039; === $form || &#039;themezip&#039; === $form ) {
				if ( ! wp_zip_file_is_valid( $file[&#039;file&#039;] ) ) {
					wp_delete_file( $file[&#039;file&#039;] );

					if ( &#039;pluginzip&#039; === $form ) {
						$plugins_page = sprintf(
							&#039;&lt;a href=&quot;%s&quot;&gt;%s&lt;/a&gt;&#039;,
							self_admin_url( &#039;plugin-install.php&#039; ),
							__( &#039;Return to the Plugin Installer&#039; )
						);
						wp_die( __( &#039;Incompatible Archive.&#039; ) . &#039;&lt;br /&gt;&#039; . $plugins_page );
					}

					if ( &#039;themezip&#039; === $form ) {
						$themes_page = sprintf(
							&#039;&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;&#039;,
							self_admin_url( &#039;theme-install.php&#039; ),
							__( &#039;Return to the Theme Installer&#039; )
						);
						wp_die( __( &#039;Incompatible Archive.&#039; ) . &#039;&lt;br /&gt;&#039; . $themes_page );
					}
				}
			}

			$this-&gt;filename = $_FILES[ $form ][&#039;name&#039;];
			$this-&gt;package  = $file[&#039;file&#039;];

			// Construct the attachment array.
			$attachment = array(
				&#039;post_title&#039;     =&gt; $this-&gt;filename,
				&#039;post_content&#039;   =&gt; $file[&#039;url&#039;],
				&#039;post_mime_type&#039; =&gt; $file[&#039;type&#039;],
				&#039;guid&#039;           =&gt; $file[&#039;url&#039;],
				&#039;context&#039;        =&gt; &#039;upgrader&#039;,
				&#039;post_status&#039;    =&gt; &#039;private&#039;,
			);

			// Save the data.
			$this-&gt;id = wp_insert_attachment( $attachment, $file[&#039;file&#039;] );

			// Schedule a cleanup for 2 hours from now in case of failed installation.
			wp_schedule_single_event( time() + 2 * HOUR_IN_SECONDS, &#039;upgrader_scheduled_cleanup&#039;, array( $this-&gt;id ) );

		} elseif ( is_numeric( $_GET[ $urlholder ] ) ) {
			// Numeric Package = previously uploaded file, see above.
			$this-&gt;id   = (int) $_GET[ $urlholder ];
			$attachment = get_post( $this-&gt;id );
			if ( empty( $attachment ) ) {
				wp_die( __( &#039;Please select a file&#039; ) );
			}

			$this-&gt;filename = $attachment-&gt;post_title;
			$this-&gt;package  = get_attached_file( $attachment-&gt;ID );
		} else {
			// Else, It&#039;s set to something, Back compat for plugins using the old (pre-3.3) File_Uploader handler.
			$uploads = wp_upload_dir();
			if ( ! ( $uploads &amp;&amp; false === $uploads[&#039;error&#039;] ) ) {
				wp_die( $uploads[&#039;error&#039;] );
			}

			$this-&gt;filename = sanitize_file_name( $_GET[ $urlholder ] );
			$this-&gt;package  = $uploads[&#039;basedir&#039;] . &#039;/&#039; . $this-&gt;filename;

			if ( ! str_starts_with( realpath( $this-&gt;package ), realpath( $uploads[&#039;basedir&#039;] ) ) ) {
				wp_die( __( &#039;Please select a file&#039; ) );
			}
		}
	}

	/**
	 * Deletes the attachment/uploaded file.
	 *
	 * @since 3.2.2
	 *
	 * @return bool Whether the cleanup was successful.
	 */
	public function cleanup() {
		if ( $this-&gt;id ) {
			wp_delete_attachment( $this-&gt;id );

		} elseif ( file_exists( $this-&gt;package ) ) {
			return @unlink( $this-&gt;package );
		}

		return true;
	}
}
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