A wrapper for PHP’s parse_url() function that handles consistency in the return values across PHP versions.

Description

Across various PHP versions, schemeless URLs containing a ":" in the query are being handled inconsistently. This function works around those differences.

Parameters

$urlstringrequired

The URL to parse.

$componentintoptional

The specific component to retrieve. Use one of the PHP predefined constants to specify which one.
Defaults to -1 (= return all parts as an array).

Default:-1

Return

Source

function wp_parse_url( $url, $component = -1 ) {
	$to_unset = array();
	$url      = (string) $url;

	if ( str_starts_with( $url, '//' ) ) {
		$to_unset[] = 'scheme';
		$url        = 'placeholder:' . $url;
	} elseif ( str_starts_with( $url, '/' ) ) {
		$to_unset[] = 'scheme';
		$to_unset[] = 'host';
		$url        = 'placeholder://placeholder' . $url;
	}

	$parts = parse_url( $url );

	if ( false === $parts ) {
		// Parsing failure.
		return $parts;
	}

	// Remove the placeholder values.
	foreach ( $to_unset as $key ) {
		unset( $parts[ $key ] );
	}

	return _get_component_from_parsed_url_array( $parts, $component );
}

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