<h3>Düzenle: theme-previews.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/**
 * Theme previews using the Site Editor for block themes.
 *
 * @package WordPress
 */

/**
 * Filters the blog option to return the path for the previewed theme.
 *
 * @since 6.3.0
 *
 * @param string $current_stylesheet The current theme&#039;s stylesheet or template path.
 * @return string The previewed theme&#039;s stylesheet or template path.
 */
function wp_get_theme_preview_path( $current_stylesheet = null ) {
	if ( ! current_user_can( &#039;switch_themes&#039; ) ) {
		return $current_stylesheet;
	}

	$preview_stylesheet = ! empty( $_GET[&#039;wp_theme_preview&#039;] ) ? sanitize_text_field( wp_unslash( $_GET[&#039;wp_theme_preview&#039;] ) ) : null;
	$wp_theme           = wp_get_theme( $preview_stylesheet );
	if ( ! is_wp_error( $wp_theme-&gt;errors() ) ) {
		if ( current_filter() === &#039;template&#039; ) {
			$theme_path = $wp_theme-&gt;get_template();
		} else {
			$theme_path = $wp_theme-&gt;get_stylesheet();
		}

		return sanitize_text_field( $theme_path );
	}

	return $current_stylesheet;
}

/**
 * Adds a middleware to `apiFetch` to set the theme for the preview.
 * This adds a `wp_theme_preview` URL parameter to API requests from the Site Editor, so they also respond as if the theme is set to the value of the parameter.
 *
 * @since 6.3.0
 */
function wp_attach_theme_preview_middleware() {
	// Don&#039;t allow non-admins to preview themes.
	if ( ! current_user_can( &#039;switch_themes&#039; ) ) {
		return;
	}

	wp_add_inline_script(
		&#039;wp-api-fetch&#039;,
		sprintf(
			&#039;wp.apiFetch.use( wp.apiFetch.createThemePreviewMiddleware( %s ) );&#039;,
			wp_json_encode( sanitize_text_field( wp_unslash( $_GET[&#039;wp_theme_preview&#039;] ) ) )
		),
		&#039;after&#039;
	);
}

/**
 * Set a JavaScript constant for theme activation.
 *
 * Sets the JavaScript global WP_BLOCK_THEME_ACTIVATE_NONCE containing the nonce
 * required to activate a theme. For use within the site editor.
 *
 * @see https://github.com/WordPress/gutenberg/pull/41836
 *
 * @since 6.3.0
 * @access private
 */
function wp_block_theme_activate_nonce() {
	$nonce_handle = &#039;switch-theme_&#039; . wp_get_theme_preview_path();
	?&gt;
	&lt;script type=&quot;text/javascript&quot;&gt;
		window.WP_BLOCK_THEME_ACTIVATE_NONCE = &lt;?php echo wp_json_encode( wp_create_nonce( $nonce_handle ) ); ?&gt;;
	&lt;/script&gt;
	&lt;?php
}

/**
 * Add filters and actions to enable Block Theme Previews in the Site Editor.
 *
 * The filters and actions should be added after `pluggable.php` is included as they may
 * trigger code that uses `current_user_can()` which requires functionality from `pluggable.php`.
 *
 * @since 6.3.2
 */
function wp_initialize_theme_preview_hooks() {
	if ( ! empty( $_GET[&#039;wp_theme_preview&#039;] ) ) {
		add_filter( &#039;stylesheet&#039;, &#039;wp_get_theme_preview_path&#039; );
		add_filter( &#039;template&#039;, &#039;wp_get_theme_preview_path&#039; );
		add_action( &#039;init&#039;, &#039;wp_attach_theme_preview_middleware&#039; );
		add_action( &#039;admin_head&#039;, &#039;wp_block_theme_activate_nonce&#039; );
	}
}
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