sanitize_html_class( string $class, string $fallback = '' )

Sanitizes an HTML classname to ensure it only contains valid characters.

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Description Description

Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty string then it will return the alternative value supplied.

Parameters Parameters

$class

(string) (Required) The classname to be sanitized

$fallback

(string) (Optional) The value to return if the sanitization ends up as an empty string. Defaults to an empty string.

Default value: ''

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Return Return

(string) The sanitized value

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Source Source

File: wp-includes/formatting.php 

function sanitize_html_class( $class, $fallback = '' ) {
	//Strip out any % encoded octets
	$sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );

	//Limit to A-Z,a-z,0-9,_,-
	$sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );

	if ( '' == $sanitized && $fallback ) {
		return sanitize_html_class( $fallback );
	}
	/**
	 * Filters a sanitized HTML class string.
	 *
	 * @since 2.8.0
	 *
	 * @param string $sanitized The sanitized HTML class.
	 * @param string $class     HTML class before sanitization.
	 * @param string $fallback  The fallback string.
	 */
	return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );
}

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Changelog Changelog

Changelog
Version Description
2.8.0 Introduced.

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Used By Used By

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User Contributed Notes User Contributed Notes

  2. Skip to note content
    Contributed by lieutenantdan —

    Created this function to help escape multiple HTML classes, you can give it an array of classes or a string of them separated by a delimiter:

    if( ! function_exists("sanitize_html_classes") ){
    function sanitize_html_classes($classes, $sep = " "){
        $return = "";

        if(!is_array($classes)) {
            $classes = explode($sep, $classes);
        }

        if(!empty($classes)){
            foreach($classes as $class){
                $return .= sanitize_html_class($class) . " ";
            }
        }

        return $return;
    }
}

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