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wp_kses_hair_parse( string $attr )

Builds an attribute list from string containing attributes.

Description

Does not modify input. May return "evil" output. In case of unexpected input, returns false instead of stripping things.

Based on wp_kses_hair() but does not return a multi-dimensional array.

Parameters

$attr

(string) (Required) Attribute list from HTML element to closing HTML element tag.

Return

(array|bool) List of attributes found in $attr. Returns false on failure.

Source

File: wp-includes/kses.php

function wp_kses_hair_parse( $attr ) {
	if ( '' === $attr ) {
		return array();
	}

	// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
	$regex =
	'(?:'
	.     '[-a-zA-Z:]+'   // Attribute name.
	. '|'
	.     '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html.
	. ')'
	. '(?:'               // Attribute value.
	.     '\s*=\s*'       // All values begin with '='
	.     '(?:'
	.         '"[^"]*"'   // Double-quoted
	.     '|'
	.         "'[^']*'"   // Single-quoted
	.     '|'
	.         '[^\s"\']+' // Non-quoted
	.         '(?:\s|$)'  // Must have a space
	.     ')'
	. '|'
	.     '(?:\s|$)'      // If attribute has no value, space is required.
	. ')'
	. '\s*';              // Trailing space is optional except as mentioned above.
	// phpcs:enable

	// Although it is possible to reduce this procedure to a single regexp,
	// we must run that regexp twice to get exactly the expected result.

	$validation = "%^($regex)+$%";
	$extraction = "%$regex%";

	if ( 1 === preg_match( $validation, $attr ) ) {
		preg_match_all( $extraction, $attr, $attrarr );
		return $attrarr[0];
	} else {
		return false;
	}
}

Changelog

Version Description
4.2.3 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wp_kses_hair_parse