WP_Filesystem_ftpsockets::put_contents( string $file, string $contents, int|false $mode = false )

	public function put_contents($file, $contents, $mode = false ) {
		$temp = wp_tempnam( $file );
		if ( ! $temphandle = @fopen($temp, 'w+') ) {
			unlink($temp);
			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 || $bytes_written != strlen( $contents ) ) {
			fclose( $temphandle );
			unlink( $temp );

			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();

		fclose($temphandle);
		unlink($temp);

		$this->chmod($file, $mode);

		return $ret;
	}