Online PHP editor | output for 9iDIW

<?php

$url = '//[::FFFF::127.0.0.1]/';

var_dump( wp_parse_url( $url ), parse_url( $url ) );

$url = 'http://[::FFFF::127.0.0.1]/';

var_dump( wp_parse_url( $url ), parse_url( $url ) );

function wp_parse_url( $url ) {
	$parts = @parse_url( $url );
	if ( ! $parts ) {
		// < PHP 5.4.7 compat, trouble with relative paths including a scheme break in the path
		if ( '/' == $url[0] && false !== strpos( $url, '://' ) ) {
			// Since we know it's a relative path, prefix with a scheme/host placeholder and try again
			if ( ! $parts = @parse_url( 'placeholder://placeholder' . $url ) ) {
				return $parts;
			}
			// Remove the placeholder values
			unset( $parts['scheme'], $parts['host'] );
		} else {
			return $parts;
		}
	}
	
	// < PHP 5.4.7 compat, doesn't detect schemeless URL's host field
	if ( '//' == substr( $url, 0, 2 ) && ! isset( $parts['host'] ) ) {
		$path_parts = explode( '/', substr( $parts['path'], 2 ), 2 );
		$parts['host'] = $path_parts[0];
		if ( isset( $path_parts[1] ) ) {
			$parts['path'] = '/' . $path_parts[1];
		} else {
			unset( $parts['path'] );
		}
	}
	
	return $parts;
}

eol versions

based on 02YHb

Output for 5.4.8 - 7.2.0: array(2) { ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" } array(2) { ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" }
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.4.7: array(2) { ["path"]=> string(1) "/" ["host"]=> string(19) "[::FFFF::127.0.0.1]" } array(1) { ["path"]=> string(22) "//[::FFFF::127.0.0.1]/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" }
Output for 4.3.7 - 4.3.11, 5.0.0 - 5.0.4: array(3) { ["scheme"]=> string(3) "//[" ["path"]=> string(1) "/" ["host"]=> string(15) "FFF::127.0.0.1]" } array(2) { ["scheme"]=> string(3) "//[" ["path"]=> string(18) ":FFFF::127.0.0.1]/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" } array(3) { ["scheme"]=> string(4) "http" ["host"]=> string(19) "[::FFFF::127.0.0.1]" ["path"]=> string(1) "/" }
Output for 4.3.2 - 4.3.6: array(3) { ["scheme"]=> string(3) "//[" ["path"]=> string(1) "/" ["host"]=> string(15) "FFF::127.0.0.1]" } array(2) { ["scheme"]=> string(3) "//[" ["path"]=> string(18) ":FFFF::127.0.0.1]/" } Warning: parse_url(http://[::FFFF::127.0.0.1]/): Unable to parse url in /in/9iDIW on line 9 bool(false) bool(false)
Output for 4.3.0 - 4.3.1: array(3) { ["scheme"]=> string(3) "//[" ["path"]=> string(1) "/" ["host"]=> string(15) "FFF::127.0.0.1]" } array(2) { ["scheme"]=> string(3) "//[" ["path"]=> string(18) ":FFFF::127.0.0.1]/" } Warning: parse_url(http://[::FFFF::127.0.0.1]/) [http://www.php.net/function.parse-url]: Unable to parse url in /in/9iDIW on line 9 bool(false) bool(false)