_unzip_file_pclzip( string $file, string $to, string[] $needed_dirs = array() ): true|WP_Error

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness. Use unzip_file() instead.

Attempts to unzip an archive using the PclZip library.

Description

This function should not be called directly, use unzip_file() instead.

Assumes that WP_Filesystem() has already been called and set up.

See also

Parameters

$filestringrequired
Full path and filename of ZIP archive.
$tostringrequired
Full path on the filesystem to extract archive to.
$needed_dirsstring[]optional
A partial list of required folders needed to be created.

Default:array()

Return

true|WP_Error True on success, WP_Error on failure.

Source

 * Attempts to unzip an archive using the PclZip library.
 *
 * This function should not be called directly, use `unzip_file()` instead.
 *
 * Assumes that WP_Filesystem() has already been called and set up.
 *
 * @since 3.0.0
 * @access private
 *
 * @see unzip_file()
 *
 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
 *
 * @param string   $file        Full path and filename of ZIP archive.
 * @param string   $to          Full path on the filesystem to extract archive to.
 * @param string[] $needed_dirs A partial list of required folders needed to be created.
 * @return true|WP_Error True on success, WP_Error on failure.
 */
function _unzip_file_pclzip( $file, $to, $needed_dirs = array() ) {
	global $wp_filesystem;

	mbstring_binary_safe_encoding();

	require_once ABSPATH . 'wp-admin/includes/class-pclzip.php';

	$archive = new PclZip( $file );

	$archive_files = $archive->extract( PCLZIP_OPT_EXTRACT_AS_STRING );

	reset_mbstring_encoding();

	// Is the archive valid?
	if ( ! is_array( $archive_files ) ) {
		return new WP_Error( 'incompatible_archive', __( 'Incompatible Archive.' ), $archive->errorInfo( true ) );
	}

	if ( 0 === count( $archive_files ) ) {
		return new WP_Error( 'empty_archive_pclzip', __( 'Empty archive.' ) );
	}

	$uncompressed_size = 0;

	// Determine any children directories needed (From within the archive).
	foreach ( $archive_files as $file ) {
		if ( str_starts_with( $file['filename'], '__MACOSX/' ) ) { // Skip the OS X-created __MACOSX directory.
			continue;
		}

		$uncompressed_size += $file['size'];

		$needed_dirs[] = $to . untrailingslashit( $file['folder'] ? $file['filename'] : dirname( $file['filename'] ) );
	}

	// Enough space to unzip the file and copy its contents, with a 10% buffer.
	$required_space = $uncompressed_size * 2.1;

	/*
	 * disk_free_space() could return false. Assume that any falsey value is an error.
	 * A disk that has zero free bytes has bigger problems.
	 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
	 */
	if ( wp_doing_cron() ) {
		$available_space = function_exists( 'disk_free_space' ) ? @disk_free_space( WP_CONTENT_DIR ) : false;

		if ( $available_space && ( $required_space > $available_space ) ) {
			return new WP_Error(
				'disk_full_unzip_file',
				__( 'Could not copy files. You may have run out of disk space.' ),
				compact( 'uncompressed_size', 'available_space' )
			);
		}
	}

	$needed_dirs = array_unique( $needed_dirs );

	foreach ( $needed_dirs as $dir ) {
		// Check the parent folders of the folders all exist within the creation array.
		if ( untrailingslashit( $to ) === $dir ) { // Skip over the working directory, we know this exists (or will exist).
			continue;
		}

		if ( ! str_contains( $dir, $to ) ) { // If the directory is not within the working directory, skip it.
			continue;
		}

		$parent_folder = dirname( $dir );

		while ( ! empty( $parent_folder )
			&& untrailingslashit( $to ) !== $parent_folder
			&& ! in_array( $parent_folder, $needed_dirs, true )
		) {
			$needed_dirs[] = $parent_folder;
			$parent_folder = dirname( $parent_folder );
		}
	}

	asort( $needed_dirs );

	// Create those directories if need be:
	foreach ( $needed_dirs as $_dir ) {
		// Only check to see if the dir exists upon creation failure. Less I/O this way.
		if ( ! $wp_filesystem->mkdir( $_dir, FS_CHMOD_DIR ) && ! $wp_filesystem->is_dir( $_dir ) ) {
			return new WP_Error( 'mkdir_failed_pclzip', __( 'Could not create directory.' ), $_dir );
		}
	}

	/** This filter is documented in src/wp-admin/includes/file.php */
	$pre = apply_filters( 'pre_unzip_file', null, $file, $to, $needed_dirs, $required_space );

	if ( null !== $pre ) {
		return $pre;
	}

	// Extract the files from the zip.
	foreach ( $archive_files as $file ) {
		if ( $file['folder'] ) {
			continue;
		}

		if ( str_starts_with( $file['filename'], '__MACOSX/' ) ) { // Don't extract the OS X-created __MACOSX directory files.
			continue;
		}

Changelog

VersionDescription
3.0.0Introduced.

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