* Filters whether Apache and mod_rewrite are present.

	 * like nginx. Use the {@see 'got_url_rewrite'} filter in got_url_rewrite() instead.

 * @global bool $is_nginx

 *

	 * Filters whether URL rewriting is available.

 * Extracts strings from between the BEGIN and END markers in the .htaccess file.

	if ( ! file_exists( $filename ) ) {

	$markerdata = explode( "\n", implode( '', file( $filename ) ) );

	$state = false;

	foreach ( $markerdata as $markerline ) {

		if ( false !== strpos( $markerline, '# END ' . $marker ) ) {

			$state = false;

		}

		if ( $state ) {

			$result[] = $markerline;

		}

		if ( false !== strpos( $markerline, '# BEGIN ' . $marker ) ) {

			$state = true;

 * Inserts an array of strings into a file (.htaccess ), placing it between

 * BEGIN and END markers.

 * Replaces existing marked info. Retains surrounding

 * @param string       $filename  Filename to alter.

 * @param string       $marker    The marker to alter.

 * @param array|string $insertion The new content to insert.

	if ( ! file_exists( $filename ) ) {

		if ( ! is_writable( dirname( $filename ) ) ) {

			return false;

		if ( ! touch( $filename ) ) {

		}

	} elseif ( ! is_writeable( $filename ) ) {

		return false;

	}

	if ( ! is_array( $insertion ) ) {

		$insertion = explode( "\n", $insertion );

	}

	$start_marker = "# BEGIN {$marker}";

	$end_marker   = "# END {$marker}";

	$fp = fopen( $filename, 'r+' );

	if ( ! $fp ) {

	// Attempt to get a lock. If the filesystem supports locking, this will block until the lock is acquired.

	flock( $fp, LOCK_EX );

	$lines = array();

	while ( ! feof( $fp ) ) {

		$lines[] = rtrim( fgets( $fp ), "\r\n" );

	}

	// Split out the existing file into the preceding lines, and those that appear after the marker

	$pre_lines = $post_lines = $existing_lines = array();

	$found_marker = $found_end_marker = false;

	foreach ( $lines as $line ) {

		if ( ! $found_marker && false !== strpos( $line, $start_marker ) ) {

			$found_marker = true;

			continue;

		} elseif ( ! $found_end_marker && false !== strpos( $line, $end_marker ) ) {

			$found_end_marker = true;

			continue;

		}

		if ( ! $found_marker ) {

			$pre_lines[] = $line;

		} elseif ( $found_marker && $found_end_marker ) {

			$post_lines[] = $line;

		} else {

			$existing_lines[] = $line;

		}

	}

	// Check to see if there was a change

	if ( $existing_lines === $insertion ) {

		flock( $fp, LOCK_UN );

		fclose( $fp );

		return true;

	}

	// Generate the new file data

	$new_file_data = implode( "\n", array_merge(

		$pre_lines,

		array( $start_marker ),

		$insertion,

		array( $end_marker ),

		$post_lines

	) );

	// Write to the start of the file, and truncate it to that length

	fseek( $fp, 0 );

	$bytes = fwrite( $fp, $new_file_data );

	if ( $bytes ) {

		ftruncate( $fp, ftell( $fp ) );

	}

	fflush( $fp );

	flock( $fp, LOCK_UN );

	fclose( $fp );

	return (bool) $bytes;

 *

 * @global WP_Rewrite $wp_rewrite

 *

 * @return bool|null True on write success, false on failure. Null in multisite.

	// Ensure get_home_path() is declared.

	require_once( ABSPATH . 'wp-admin/includes/file.php' );

	$home_path     = get_home_path();

	$htaccess_file = $home_path . '.htaccess';

 * @global WP_Rewrite $wp_rewrite

 *

 * @return bool|null True on write success, false on failure. Null in multisite.

	// Ensure get_home_path() is declared.

	require_once( ABSPATH . 'wp-admin/includes/file.php' );

	$home_path       = get_home_path();

 * Update the "recently-edited" file for the plugin or theme editor.

 * Makes a tree structure for the Theme Editor's file list.

 *

 * @since 4.9.0

 * @access private

 *

 * @param array $allowed_files List of theme file paths.

 * @return array Tree structure for listing theme files.

 */

function wp_make_theme_file_tree( $allowed_files ) {

	$tree_list = array();

	foreach ( $allowed_files as $file_name => $absolute_filename ) {

		$list = explode( '/', $file_name );

		$last_dir = &$tree_list;

		foreach ( $list as $dir ) {

			$last_dir =& $last_dir[ $dir ];

		}

		$last_dir = $file_name;

	}

	return $tree_list;

}

/**

 * Outputs the formatted file list for the Theme Editor.

 *

 * @since 4.9.0

 * @access private

 *

 * @param array|string $tree  List of file/folder paths, or filename.

 * @param int          $level The aria-level for the current iteration.

 * @param int          $size  The aria-setsize for the current iteration.

 * @param int          $index The aria-posinset for the current iteration.

 */

function wp_print_theme_file_tree( $tree, $level = 2, $size = 1, $index = 1 ) {

	global $relative_file, $stylesheet;

	if ( is_array( $tree ) ) {

		$index = 0;

		$size = count( $tree );

		foreach ( $tree as $label => $theme_file ) :

			$index++;

			if ( ! is_array( $theme_file ) ) {

				wp_print_theme_file_tree( $theme_file, $level, $index, $size );

				continue;

			}

			?>

			<li role="treeitem" aria-expanded="true" tabindex="-1"

				aria-level="<?php echo esc_attr( $level ); ?>"

				aria-setsize="<?php echo esc_attr( $size ); ?>"

				aria-posinset="<?php echo esc_attr( $index ); ?>">

				<span class="folder-label"><?php echo esc_html( $label ); ?> <span class="screen-reader-text"><?php _e( 'folder' ); ?></span><span aria-hidden="true" class="icon"></span></span>

				<ul role="group" class="tree-folder"><?php wp_print_theme_file_tree( $theme_file, $level + 1, $index, $size ); ?></ul>

			</li>

			<?php

		endforeach;

	} else {

		$filename = $tree;

		$url = add_query_arg(

			array(

				'file' => rawurlencode( $tree ),

				'theme' => rawurlencode( $stylesheet ),

			),

			self_admin_url( 'theme-editor.php' )

		);

		?>

		<li role="none" class="<?php echo esc_attr( $relative_file === $filename ? 'current-file' : '' ); ?>">

			<a role="treeitem" tabindex="<?php echo esc_attr( $relative_file === $filename ? '0' : '-1' ); ?>"

				href="<?php echo esc_url( $url ); ?>"

				aria-level="<?php echo esc_attr( $level ); ?>"

				aria-setsize="<?php echo esc_attr( $size ); ?>"

				aria-posinset="<?php echo esc_attr( $index ); ?>">

				<?php

				$file_description = esc_html( get_file_description( $filename ) );

				if ( $file_description !== $filename && basename( $filename ) !== $file_description ) {

					$file_description .= '<br /><span class="nonessential">(' . esc_html( $filename ) . ')</span>';

				}

				if ( $relative_file === $filename ) {

					echo '<span class="notice notice-info">' . $file_description . '</span>';

				} else {

					echo $file_description;

				}

				?>

			</a>

		</li>

		<?php

	}

}

/**

 * Makes a tree structure for the Plugin Editor's file list.

 *

 * @since 4.9.0

 * @access private

 *

 * @param string $plugin_editable_files List of plugin file paths.

 * @return array Tree structure for listing plugin files.

 */

function wp_make_plugin_file_tree( $plugin_editable_files ) {

	$tree_list = array();

	foreach ( $plugin_editable_files as $plugin_file ) {

		$list = explode( '/', preg_replace( '#^.+?/#', '', $plugin_file ) );

		$last_dir = &$tree_list;

		foreach ( $list as $dir ) {

			$last_dir =& $last_dir[ $dir ];

		}

		$last_dir = $plugin_file;

	}

	return $tree_list;

}

/**

 * Outputs the formatted file list for the Plugin Editor.

 *

 * @since 4.9.0

 * @access private

 *

 * @param array|string $tree  List of file/folder paths, or filename.

 * @param string       $label Name of file or folder to print.

 * @param int          $level The aria-level for the current iteration.

 * @param int          $size  The aria-setsize for the current iteration.

 * @param int          $index The aria-posinset for the current iteration.

 */

function wp_print_plugin_file_tree( $tree, $label = '', $level = 2, $size = 1, $index = 1 ) {

	global $file, $plugin;

	if ( is_array( $tree ) ) {

		$index = 0;

		$size = count( $tree );

		foreach ( $tree as $label => $plugin_file ) :

			$index++;

			if ( ! is_array( $plugin_file ) ) {

				wp_print_plugin_file_tree( $plugin_file, $label, $level, $index, $size );

				continue;