WP_Filesystem_ftpsockets::is_file( string $file )

Source

File: wp-admin/includes/class-wp-filesystem-ftpsockets.php

public function is_file( $file ) {
		if ( $this->is_dir( $file ) ) {
			return false;
		}

		if ( $this->exists( $file ) ) {
			return true;
		}

		return false;
	}