PO::prepend_each_line( string $input_string, string $with )

187		public static function prepend_each_line( $input_string, $with ) {188			$lines  = explode( "\n", $input_string );189			$append = '';190			if ( "\n" === substr( $input_string, -1 ) && '' === end( $lines ) ) {191				/*192				 * Last line might be empty because $input_string was terminated193				 * with a newline, remove it from the $lines array,194				 * we'll restore state by re-terminating the string at the end.195				 */196				array_pop( $lines );197				$append = "\n";198			}199			foreach ( $lines as &$line ) {200				$line = $with . $line;201			}202			unset( $line );203			return implode( "\n", $lines ) . $append;204		}