WP_Filesystem_ftpsockets::put_contents

	 * @param string    $file     Remote path to the file where to write the data.
	 * @param string    $contents The data to write.
	 * @param int|false $mode     Optional. The file permissions as octal number, usually 0644.
	 *                            Default false.
	 * @return bool True on success, false on failure.
	 */
	public function put_contents( $file, $contents, $mode = false ) {
		$tempfile   = wp_tempnam( $file );
		$temphandle = @fopen( $tempfile, 'w+' );

		if ( ! $temphandle ) {
			unlink( $tempfile );
			return false;
		}

		// The FTP class uses string functions internally during file download/upload.
		mbstring_binary_safe_encoding();

		$bytes_written = fwrite( $temphandle, $contents );

		if ( false === $bytes_written || strlen( $contents ) != $bytes_written ) {
			fclose( $temphandle );
			unlink( $tempfile );

			reset_mbstring_encoding();

			return false;
		}

		fseek( $temphandle, 0 ); // Skip back to the start of the file being written to.

		$ret = $this->ftp->fput( $file, $temphandle );

		reset_mbstring_encoding();