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hm-backup.php
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<?php
/**
* Generic file and database backup class
*
* @version 2.2
*/
class HM_Backup {
/**
* The path where the backup file should be saved
*
* @string
*/
private $path = '';
/**
* The backup type, must be either complete, file or database
*
* @string
*/
private $type = '';
/**
* The filename of the backup file
*
* @string
*/
private $archive_filename = '';
/**
* The filename of the database dump
*
* @string
*/
private $database_dump_filename = '';
/**
* The path to the zip command
*
* @string
*/
private $zip_command_path;
/**
* The path to the mysqldump command
*
* @string
*/
private $mysqldump_command_path;
/**
* An array of exclude rules
*
* @array
*/
private $excludes = array();
/**
* The path that should be backed up
*
* @var string
*/
private $root = '';
/**
* Holds the current db connection
*
* @var resource
*/
private $db;
/**
* An array of all the files in root
* excluding excludes and unreadable files
*
* @var array
*/
private $files = array();
/**
* An array of all the files in root
* that match the exclude rules
*
* @var array
*/
private $excluded_files = array();
/**
* An array of all the files in root
* that are unreadable
*
* @var array
*/
private $unreadable_files = array();
/**
* Contains an array of errors
*
* @var mixed
*/
private $errors = array();
/**
* Contains an array of warnings
*
* @var mixed
*/
private $warnings = array();
/**
* The archive method used
*
* @var string
*/
private $archive_method = '';
/**
* The mysqldump method used
*
* @var string
*/
private $mysqldump_method = '';
/**
* @var bool
*/
protected $mysqldump_verified = false;
/**
* @var bool
*/
protected $archive_verified = false;
/**
* @var array
*/
protected $included_files = array();
/**
* @var int
*/
protected $included_file_count = 0;
/**
* @var int
*/
protected $excluded_file_count = 0;
/**
* @var int
*/
protected $get_unreadable_file_count = 0;
/**
* Check whether safe mode is active or not
*
* @param string $ini_get_callback
* @return bool
*/
public static function is_safe_mode_active( $ini_get_callback = 'ini_get' ) {
if ( ( $safe_mode = @call_user_func( $ini_get_callback, 'safe_mode' ) ) && strtolower( $safe_mode ) != 'off' )
return true;
return false;
}
/**
* Check whether shell_exec has been disabled.
*
* @return bool
*/
public static function is_shell_exec_available() {
// Are we in Safe Mode
if ( self::is_safe_mode_active() )
return false;
// Is shell_exec or escapeshellcmd or escapeshellarg disabled?
if ( array_intersect( array( 'shell_exec', 'escapeshellarg', 'escapeshellcmd' ), array_map( 'trim', explode( ',', @ini_get( 'disable_functions' ) ) ) ) )
return false;
// Functions can also be disabled via suhosin
if ( array_intersect( array( 'shell_exec', 'escapeshellarg', 'escapeshellcmd' ), array_map( 'trim', explode( ',', @ini_get( 'suhosin.executor.func.blacklist' ) ) ) ) )
return false;
// Can we issue a simple echo command?
if ( ! @shell_exec( 'echo backupwordpress' ) )
return false;
return true;
}
/**
* Attempt to work out the root directory of the site, that
* is, the path equivelant of home_url().
*
* @return string $home_path
*/
public static function get_home_path() {
$home_url = home_url();
$site_url = site_url();
$home_path = ABSPATH;
// Attempt to guess the home path based on the location of wp-config.php
if ( ! file_exists( ABSPATH . 'wp-config.php' ) ) {
$home_path = trailingslashit( dirname( ABSPATH ) );
}
// If site_url contains home_url and they differ then assume WordPress is installed in a sub directory
if ( $home_url !== $site_url && strpos( $site_url, $home_url ) === 0 )
$home_path = trailingslashit( substr( self::conform_dir( ABSPATH ), 0, strrpos( self::conform_dir( ABSPATH ), str_replace( $home_url, '', $site_url ) ) ) );
return self::conform_dir( $home_path );
}
/**
* Sanitize a directory path
*
* @param string $dir
* @param bool $recursive
* @return string
*/
public static function conform_dir( $dir, $recursive = false ) {
// Assume empty dir is root
if ( ! $dir )
$dir = '/';
// Replace single forward slash (looks like double slash because we have to escape it)
$dir = str_replace( '\\', '/', $dir );
$dir = str_replace( '//', '/', $dir );
// Remove the trailing slash
if ( $dir !== '/' )
$dir = untrailingslashit( $dir );
// Carry on until completely normalized
if ( ! $recursive && self::conform_dir( $dir, true ) != $dir )
return self::conform_dir( $dir );
return (string) $dir;
}
/**
* Sets up the default properties
*/
public function __construct() {
// Raise the memory limit and max_execution time
@ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) );
@set_time_limit( 0 );
// Set a custom error handler so we can track errors
set_error_handler( array( $this, 'error_handler' ) );
}
/**
* Get the full filepath to the archive file
*
* @return string
*/
public function get_archive_filepath() {
return trailingslashit( $this->get_path() ) . $this->get_archive_filename();
}
/**
* Get the filename of the archive file
*
* @return string
*/
public function get_archive_filename() {
if ( empty( $this->archive_filename ) )
$this->set_archive_filename( implode( '-', array( sanitize_title( str_ireplace( array( 'http://', 'https://', 'www' ), '', home_url() ) ), 'backup', date( 'Y-m-d-H-i-s', current_time( 'timestamp' ) ) ) ) . '.zip' );
return $this->archive_filename;
}
/**
* Set the filename of the archive file
*
* @param string $filename
* @return WP_Error
*/
public function set_archive_filename( $filename ) {
if ( empty( $filename ) || ! is_string( $filename ) )
return new WP_Error( 'invalid_file_name', __( 'archive filename must be a non empty string', 'hmbkp' ) );
if ( pathinfo( $filename, PATHINFO_EXTENSION ) !== 'zip' )
return new WP_Error( 'invalid_file_extension', sprintf( __( 'invalid file extension for archive filename <code>%s</code>', 'hmbkp' ), $filename ) );
$this->archive_filename = strtolower( sanitize_file_name( remove_accents( $filename ) ) );
}
/**
* Get the full filepath to the database dump file.
*
* @return string
*/
public function get_database_dump_filepath() {
return trailingslashit( $this->get_path() ) . $this->get_database_dump_filename();
}
/**
* Get the filename of the database dump file
*
* @return string
*/
public function get_database_dump_filename() {
if ( empty( $this->database_dump_filename ) )
$this->set_database_dump_filename( 'database_' . DB_NAME . '.sql' );
return $this->database_dump_filename;
}
/**
* Set the filename of the database dump file
*
* @param string $filename
* @return WP_Error
*/
public function set_database_dump_filename( $filename ) {
if ( empty( $filename ) || ! is_string( $filename ) )
return new WP_Error( 'invalid_file_name', __( 'database dump filename must be a non empty string', 'hmbkp' ) );
if ( pathinfo( $filename, PATHINFO_EXTENSION ) !== 'sql' )
return new WP_Error( 'invalid_file_extension', sprintf( __( 'invalid file extension for database dump filename <code>%s</code>', 'hmbkp' ), $filename ) );
$this->database_dump_filename = strtolower( sanitize_file_name( remove_accents( $filename ) ) );
}
/**
* Get the root directory to backup from
*
* Defaults to the root of the path equivalent of your home_url
*
* @return string
*/
public function get_root() {
if ( empty( $this->root ) )
$this->set_root( self::conform_dir( self::get_home_path() ) );
return $this->root;
}
/**
* Set the root directory to backup from
*
* @param string $path
* @return WP_Error
*/
public function set_root( $path ) {
if ( empty( $path ) || ! is_string( $path ) || ! is_dir( $path ) )
return new WP_Error( 'invalid_directory_path', sprintf( __( 'Invalid root path <code>%s</code> must be a valid directory path', 'hmbkp' ), $path ) );
$this->root = self::conform_dir( $path );
}
/**
* Get the directory backups are saved to
*
* @return string
*/
public function get_path() {
if ( empty( $this->path ) )
$this->set_path( self::conform_dir( hmbkp_path_default() ) );
return $this->path;
}
/**
* Set the directory backups are saved to
*
* @param string $path
* @return null
*/
public function set_path( $path ) {
if ( empty( $path ) || ! is_string( $path ) )
return new WP_Error( 'invalid_backup_path', sprintf( __( 'Invalid backup path <code>%s</code> must be a non empty (string)', 'hmbkp' ), $path ) );
$this->path = self::conform_dir( $path );
}
/**
* Get the archive method that was used for the backup
*
* Will be either zip, ZipArchive or PclZip
*
*/
public function get_archive_method() {
return $this->archive_method;
}
/**
* Get the database dump method that was used for the backup
*
* Will be either mysqldump or mysqldump_fallback
*
*/
public function get_mysqldump_method() {
return $this->mysqldump_method;
}
/**
* Get the backup type
*
* Defaults to complete
*
*/
public function get_type() {
if ( empty( $this->type ) )
$this->set_type( 'complete' );
return $this->type;
}
/**
* Set the backup type
*
* $type must be one of complete, database or file
*
* @param string $type
* @return WP_Error
*/
public function set_type( $type ) {
if ( ! is_string( $type ) || ! in_array( $type, array( 'file', 'database', 'complete' ) ) )
return new WP_Error( 'invalid_backup_type', sprintf( __( 'Invalid backup type <code>%s</code> must be one of (string) file, database or complete', 'hmbkp' ), $type ) );
$this->type = $type;
}
/**
* Get the path to the mysqldump bin
*
* If not explicitly set will attempt to work
* it out by checking common locations
*
* @return string
*/
public function get_mysqldump_command_path() {
// Check shell_exec is available
if ( ! self::is_shell_exec_available() )
return '';
// Return now if it's already been set
if ( isset( $this->mysqldump_command_path ) )
return $this->mysqldump_command_path;
$this->mysqldump_command_path = '';
// Does mysqldump work
if ( is_null( shell_exec( 'hash mysqldump 2>&1' ) ) ) {
// If so store it for later
$this->set_mysqldump_command_path( 'mysqldump' );
// And return now
return $this->mysqldump_command_path;
}
// List of possible mysqldump locations
$mysqldump_locations = array(
'/usr/local/bin/mysqldump',
'/usr/local/mysql/bin/mysqldump',
'/usr/mysql/bin/mysqldump',
'/usr/bin/mysqldump',
'/opt/local/lib/mysql6/bin/mysqldump',
'/opt/local/lib/mysql5/bin/mysqldump',
'/opt/local/lib/mysql4/bin/mysqldump',
'/xampp/mysql/bin/mysqldump',
'/Program Files/xampp/mysql/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 6.0/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 5.5/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 5.4/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 5.1/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 5.0/bin/mysqldump',
'/Program Files/MySQL/MySQL Server 4.1/bin/mysqldump',
'/opt/local/bin/mysqldump'
);
// Find the first one which works
foreach ( $mysqldump_locations as $location ) {
if ( @is_executable( self::conform_dir( $location ) ) ) {
$this->set_mysqldump_command_path( $location );
break; // Found one
}
}
return $this->mysqldump_command_path;
}
/**
* Set the path to the mysqldump bin
*
* Setting the path to false will cause the database
* dump to use the php fallback
*
* @param mixed $path
*/
public function set_mysqldump_command_path( $path ) {
$this->mysqldump_command_path = $path;
}
/**
* Get the path to the zip bin
*
* If not explicitly set will attempt to work
* it out by checking common locations
*
* @return string
*/
public function get_zip_command_path() {
// Check shell_exec is available
if ( ! self::is_shell_exec_available() )
return '';
// Return now if it's already been set
if ( isset( $this->zip_command_path ) )
return $this->zip_command_path;
$this->zip_command_path = '';
// Does zip work
if ( is_null( shell_exec( 'hash zip 2>&1' ) ) ) {
// If so store it for later
$this->set_zip_command_path( 'zip' );
// And return now
return $this->zip_command_path;
}
// List of possible zip locations
$zip_locations = array(
'/usr/bin/zip',
'/opt/local/bin/zip'
);
// Find the first one which works
foreach ( $zip_locations as $location ) {
if ( @is_executable( self::conform_dir( $location ) ) ) {
$this->set_zip_command_path( $location );
break; // Found one
}
}
return $this->zip_command_path;
}
/**
* Set the path to the zip bin
*
* Setting the path to false will cause the database
* dump to use the php fallback
*
* @param mixed $path
*/
public function set_zip_command_path( $path ) {
$this->zip_command_path = $path;
}
protected function do_action( $action ) {
do_action( $action, $this );
}
/**
* Kick off a backup
*
* @return bool
*/
public function backup() {
$this->do_action( 'hmbkp_backup_started' );
// Backup database
if ( $this->get_type() !== 'file' )
$this->dump_database();
// Zip everything up
$this->archive();
$this->do_action( 'hmbkp_backup_complete' );
}
/**
* Create the mysql backup
*
* Uses mysqldump if available, falls back to PHP
* if not.
*
*/
public function dump_database() {
if ( $this->get_mysqldump_command_path() )
$this->mysqldump();
if ( empty( $this->mysqldump_verified ) )
$this->mysqldump_fallback();
$this->do_action( 'hmbkp_mysqldump_finished' );
}
public function mysqldump() {
$this->mysqldump_method = 'mysqldump';
$this->do_action( 'hmbkp_mysqldump_started' );
$host = explode( ':', DB_HOST );
$host = reset( $host );
$port = strpos( DB_HOST, ':' ) ? end( explode( ':', DB_HOST ) ) : '';
// Path to the mysqldump executable
$cmd = escapeshellarg( $this->get_mysqldump_command_path() );
// We don't want to create a new DB
$cmd .= ' --no-create-db';
// Allow lock-tables to be overridden
if ( ! defined( 'HMBKP_MYSQLDUMP_SINGLE_TRANSACTION' ) || HMBKP_MYSQLDUMP_SINGLE_TRANSACTION !== false )
$cmd .= ' --single-transaction';
// Make sure binary data is exported properly
$cmd .= ' --hex-blob';
// Username
$cmd .= ' -u ' . escapeshellarg( DB_USER );
// Don't pass the password if it's blank
if ( DB_PASSWORD )
$cmd .= ' -p' . escapeshellarg( DB_PASSWORD );
// Set the host
$cmd .= ' -h ' . escapeshellarg( $host );
// Set the port if it was set
if ( ! empty( $port ) && is_numeric( $port ) )
$cmd .= ' -P ' . $port;
// The file we're saving too
$cmd .= ' -r ' . escapeshellarg( $this->get_database_dump_filepath() );
// The database we're dumping
$cmd .= ' ' . escapeshellarg( DB_NAME );
// Pipe STDERR to STDOUT
$cmd .= ' 2>&1';
// Store any returned data in an error
$stderr = shell_exec( $cmd );
// Skip the new password warning that is output in mysql > 5.6 (@see http://bugs.mysql.com/bug.php?id=66546)
if ( trim( $stderr ) === 'Warning: Using a password on the command line interface can be insecure.' ) {
$stderr = '';
}
if ( $stderr ) {
$this->error( $this->get_mysqldump_method(), $stderr );
}
$this->verify_mysqldump();
}
/**
* PHP mysqldump fallback functions, exports the database to a .sql file
*
*/
public function mysqldump_fallback() {
$this->errors_to_warnings( $this->get_mysqldump_method() );
$this->mysqldump_method = 'mysqldump_fallback';
$this->do_action( 'hmbkp_mysqldump_started' );
$this->db = @mysql_pconnect( DB_HOST, DB_USER, DB_PASSWORD );
if ( ! $this->db )
$this->db = mysql_connect( DB_HOST, DB_USER, DB_PASSWORD );
if ( ! $this->db )
return;
mysql_select_db( DB_NAME, $this->db );
if ( function_exists( 'mysql_set_charset' ) )
mysql_set_charset( DB_CHARSET, $this->db );
// Begin new backup of MySql
$tables = mysql_query( 'SHOW TABLES' );
$sql_file = "# WordPress : " . get_bloginfo( 'url' ) . " MySQL database backup\n";
$sql_file .= "#\n";
$sql_file .= "# Generated: " . date( 'l j. F Y H:i T' ) . "\n";
$sql_file .= "# Hostname: " . DB_HOST . "\n";
$sql_file .= "# Database: " . $this->sql_backquote( DB_NAME ) . "\n";
$sql_file .= "# --------------------------------------------------------\n";
for ( $i = 0; $i < mysql_num_rows( $tables ); $i ++ ) {
$curr_table = mysql_tablename( $tables, $i );
// Create the SQL statements
$sql_file .= "# --------------------------------------------------------\n";
$sql_file .= "# Table: " . $this->sql_backquote( $curr_table ) . "\n";
$sql_file .= "# --------------------------------------------------------\n";
$this->make_sql( $sql_file, $curr_table );
}
}
/**
* Zip up all the files.
*
* Attempts to use the shell zip command, if
* thats not available then it falls back to
* PHP ZipArchive and finally PclZip.
*
*/
public function archive() {
// Do we have the path to the zip command
if ( $this->get_zip_command_path() )
$this->zip();
// If not or if the shell zip failed then use ZipArchive
if ( empty( $this->archive_verified ) && class_exists( 'ZipArchive' ) && empty( $this->skip_zip_archive ) )
$this->zip_archive();
// If ZipArchive is unavailable or one of the above failed
if ( empty( $this->archive_verified ) )
$this->pcl_zip();
// Delete the database dump file
if ( file_exists( $this->get_database_dump_filepath() ) )
unlink( $this->get_database_dump_filepath() );
$this->do_action( 'hmbkp_archive_finished' );
}
/**
* Zip using the native zip command
*/
public function zip() {
$this->archive_method = 'zip';
$this->do_action( 'hmbkp_archive_started' );
// Zip up $this->root with excludes
if ( $this->get_type() !== 'database' && $this->exclude_string( 'zip' ) )
$stderr = shell_exec( 'cd ' . escapeshellarg( $this->get_root() ) . ' && ' . escapeshellcmd( $this->get_zip_command_path() ) . ' -rq ' . escapeshellarg( $this->get_archive_filepath() ) . ' ./' . ' -x ' . $this->exclude_string( 'zip' ) . ' 2>&1' );
// Zip up $this->root without excludes
elseif ( $this->get_type() !== 'database' )
$stderr = shell_exec( 'cd ' . escapeshellarg( $this->get_root() ) . ' && ' . escapeshellcmd( $this->get_zip_command_path() ) . ' -rq ' . escapeshellarg( $this->get_archive_filepath() ) . ' ./' . ' 2>&1' );
// Add the database dump to the archive
if ( $this->get_type() !== 'file' && file_exists( $this->get_database_dump_filepath() ) )
$stderr = shell_exec( 'cd ' . escapeshellarg( $this->get_path() ) . ' && ' . escapeshellcmd( $this->get_zip_command_path() ) . ' -uq ' . escapeshellarg( $this->get_archive_filepath() ) . ' ' . escapeshellarg( $this->get_database_dump_filename() ) . ' 2>&1' );
if ( ! empty( $stderr ) )
$this->warning( $this->get_archive_method(), $stderr );
$this->verify_archive();
}
/**
* Fallback for creating zip archives if zip command is
* unavailable.
*/
public function zip_archive() {
$this->errors_to_warnings( $this->get_archive_method() );
$this->archive_method = 'ziparchive';
$this->do_action( 'hmbkp_archive_started' );
$zip = new ZipArchive();
if ( ! class_exists( 'ZipArchive' ) || ! $zip->open( $this->get_archive_filepath(), ZIPARCHIVE::CREATE ) )
return;
$excludes = $this->exclude_string( 'regex' );
if ( $this->get_type() !== 'database' ) {
$files_added = 0;
foreach ( $this->get_files() as $file ) {
// Skip dot files, they should only exist on versions of PHP between 5.2.11 -> 5.3
if ( method_exists( $file, 'isDot' ) && $file->isDot() )
continue;
// Skip unreadable files
if ( ! @realpath( $file->getPathname() ) || ! $file->isReadable() )
continue;
// Excludes
if ( $excludes && preg_match( '(' . $excludes . ')', str_ireplace( trailingslashit( $this->get_root() ), '', self::conform_dir( $file->getPathname() ) ) ) )
continue;
if ( $file->isDir() )
$zip->addEmptyDir( trailingslashit( str_ireplace( trailingslashit( $this->get_root() ), '', self::conform_dir( $file->getPathname() ) ) ) );
elseif ( $file->isFile() )
$zip->addFile( $file->getPathname(), str_ireplace( trailingslashit( $this->get_root() ), '', self::conform_dir( $file->getPathname() ) ) );
if ( ++$files_added % 500 === 0 )
if ( ! $zip->close() || ! $zip->open( $this->get_archive_filepath(), ZIPARCHIVE::CREATE ) )
return;
}
}
// Add the database
if ( $this->get_type() !== 'file' && file_exists( $this->get_database_dump_filepath() ) )
$zip->addFile( $this->get_database_dump_filepath(), $this->get_database_dump_filename() );
if ( $zip->status )
$this->warning( $this->get_archive_method(), $zip->status );
if ( $zip->statusSys )
$this->warning( $this->get_archive_method(), $zip->statusSys );
$zip->close();
$this->verify_archive();
}
/**
* Fallback for creating zip archives if zip command and ZipArchive are
* unavailable.
*
* Uses the PclZip library that ships with WordPress
*/
public function pcl_zip() {
$this->errors_to_warnings( $this->get_archive_method() );
$this->archive_method = 'pclzip';
$this->do_action( 'hmbkp_archive_started' );
global $_hmbkp_exclude_string;
$_hmbkp_exclude_string = $this->exclude_string( 'regex' );
$this->load_pclzip();
$archive = new PclZip( $this->get_archive_filepath() );
// Zip up everything
if ( $this->get_type() !== 'database' )
if ( ! $archive->add( $this->get_root(), PCLZIP_OPT_REMOVE_PATH, $this->get_root(), PCLZIP_CB_PRE_ADD, 'hmbkp_pclzip_callback' ) )
$this->warning( $this->get_archive_method(), $archive->errorInfo( true ) );
// Add the database
if ( $this->get_type() !== 'file' && file_exists( $this->get_database_dump_filepath() ) )
if ( ! $archive->add( $this->get_database_dump_filepath(), PCLZIP_OPT_REMOVE_PATH, $this->get_path() ) )
$this->warning( $this->get_archive_method(), $archive->errorInfo( true ) );
unset( $GLOBALS['_hmbkp_exclude_string'] );
$this->verify_archive();
}
public function verify_mysqldump() {
$this->do_action( 'hmbkp_mysqldump_verify_started' );
// If we've already passed then no need to check again
if ( ! empty( $this->mysqldump_verified ) )
return true;
// If there are mysqldump errors delete the database dump file as mysqldump will still have written one
if ( $this->get_errors( $this->get_mysqldump_method() ) && file_exists( $this->get_database_dump_filepath() ) )
unlink( $this->get_database_dump_filepath() );
// If we have an empty file delete it
if ( @filesize( $this->get_database_dump_filepath() ) === 0 )
unlink( $this->get_database_dump_filepath() );
// If the file still exists then it must be good
if ( file_exists( $this->get_database_dump_filepath() ) )
return $this->mysqldump_verified = true;
return false;
}
/**
* Verify that the archive is valid and contains all the files it should contain.
*
* @return bool
*/
public function verify_archive() {
$this->do_action( 'hmbkp_archive_verify_started' );
// If we've already passed then no need to check again
if ( ! empty( $this->archive_verified ) )
return true;
// If there are errors delete the backup file.
if ( $this->get_errors( $this->get_archive_method() ) && file_exists( $this->get_archive_filepath() ) )
unlink( $this->get_archive_filepath() );
// If the archive file still exists assume it's good
if ( file_exists( $this->get_archive_filepath() ) )
return $this->archive_verified = true;
return false;
}
/**
* Return an array of all files in the filesystem
*
* @return array
*/
public function get_files() {
if ( ! empty( $this->files ) )
return $this->files;
$this->files = array();
// We only want to use the RecursiveDirectoryIterator if the FOLLOW_SYMLINKS flag is available
if ( defined( 'RecursiveDirectoryIterator::FOLLOW_SYMLINKS' ) ) {
$this->files = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $this->get_root(), RecursiveDirectoryIterator::FOLLOW_SYMLINKS ), RecursiveIteratorIterator::SELF_FIRST, RecursiveIteratorIterator::CATCH_GET_CHILD );
// Skip dot files if the SKIP_DOTS flag is available
if ( defined( 'RecursiveDirectoryIterator::SKIP_DOTS' ) ) {
$this->files->setFlags( RecursiveDirectoryIterator::SKIP_DOTS + RecursiveDirectoryIterator::FOLLOW_SYMLINKS );
}
// If RecursiveDirectoryIterator::FOLLOW_SYMLINKS isn't available then fallback to a less memory efficient method
} else {
$this->files = $this->get_files_fallback( $this->get_root() );