wp-admin/includes/class-wp-filesystem-ftpext.php:16WordPress Filesystem Class for implementing FTP.
$linkresourcepublicclass WP_Filesystem_FTPext extends WP_Filesystem_Base { /** * @since 2.5.0 * @var resource */ public $link; /** * Constructor. * * @since 2.5.0 * * @param array $opt */ public function __construct( $opt = '' ) { $this->method = 'ftpext'; $this->errors = new WP_Error(); // Check if possible to use ftp functions. if ( ! extension_loaded( 'ftp' ) ) { $this->errors->add( 'no_ftp_ext', __( 'The ftp PHP extension is not available' ) ); return; } // This class uses the timeout on a per-connection basis, others use it on a per-action basis. if ( ! defined( 'FS_TIMEOUT' ) ) { define( 'FS_TIMEOUT', 4 * MINUTE_IN_SECONDS ); } if ( empty( $opt['port'] ) ) { $this->options['port'] = 21; } else { $this->options['port'] = $opt['port']; } if ( empty( $opt['hostname'] ) ) { $this->errors->add( 'empty_hostname', __( 'FTP hostname is required' ) ); } else { $this->options['hostname'] = $opt['hostname']; } // Check if the options provided are OK. if ( empty( $opt['username'] ) ) { $this->errors->add( 'empty_username', __( 'FTP username is required' ) ); } else { $this->options['username'] = $opt['username']; } if ( empty( $opt['password'] ) ) { $this->errors->add( 'empty_password', __( 'FTP password is required' ) ); } else { $this->options['password'] = $opt['password']; } $this->options['ssl'] = false; if ( isset( $opt['connection_type'] ) && 'ftps' === $opt['connection_type'] ) { $this->options['ssl'] = true; } } /** * Connects filesystem. * * @since 2.5.0 * * @return bool True on success, false on failure. */ public function connect() { if ( isset( $this->options['ssl'] ) && $this->options['ssl'] && function_exists( 'ftp_ssl_connect' ) ) { $this->link = @ftp_ssl_connect( $this->options['hostname'], $this->options['port'], FS_CONNECT_TIMEOUT ); } else { $this->link = @ftp_connect( $this->options['hostname'], $this->options['port'], FS_CONNECT_TIMEOUT ); } if ( ! $this->link ) { $this->errors->add( 'connect', sprintf(Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-filesystem-ftpext.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.