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

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

Contents

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.

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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

(string) The sanitized value

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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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Uses

Uses
Uses Description
wp-includes/formatting.php: sanitize_html_class()

Sanitizes an HTML classname to ensure it only contains valid characters.
wp-includes/formatting.php: sanitize_html_class

Filters a sanitized HTML class string.
wp-includes/plugin.php: apply_filters()

Calls the callback functions that have been added to a filter hook.

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Used By

Used By
Used By Description
wp-includes/class-wp-theme-json.php: WP_Theme_JSON::remove_insecure_settings()

Processes a setting node and returns the same node without the insecure settings.
wp-admin/includes/class-wp-media-list-table.php: WP_Media_List_Table::column_title()

Handles the title column output.
wp-includes/link-template.php: _navigation_markup()

Wraps passed links in navigational markup.
wp-login.php: login_header()

Output the login page header.
wp-admin/includes/class-wp-screen.php: WP_Screen::add_help_tab()

Add a help tab to the contextual help for the screen.
wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::display_rows()
wp-admin/includes/template.php: iframe_header()

Generic Iframe header for use with Thickbox.
wp-admin/includes/media.php: attachment_submitbox_metadata()

Displays non-editable attachment metadata in the publish meta box.
wp-admin/menu-header.php: _wp_menu_output()

Display menu.
wp-includes/formatting.php: sanitize_html_class()

Sanitizes an HTML classname to ensure it only contains valid characters.
wp-includes/post-template.php: get_post_class()

Retrieves an array of the class names for the post container element.
wp-includes/post-template.php: get_body_class()

Retrieves an array of the class names for the body element.
wp-includes/media.php: gallery_shortcode()

Builds the Gallery shortcode output.
wp-includes/media.php: img_caption_shortcode()

Builds the Caption shortcode output.
wp-includes/comment-template.php: get_comment_class()

Returns the classes for the comment div as an array.
wp-includes/class-wp-editor.php: _WP_Editors::editor_settings()
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Changelog

Changelog
Version Description
2.8.0 Introduced.

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User Contributed Notes

  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 4You must log in to vote on the helpfulness of this note
    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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  4. Skip to note 4 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by Mahdi Yazdani —

    Sanitize multiple HTML classes in one pass.

    Accepts either an array of $classes, or a space-separated string of class names and runs them to sanitize using the sanitize_html_class function.

    /**
 * Sanitize multiple HTML classes in one pass.
 *
 * @param    array  $classes           Classes to be sanitized.
 * @param    string $return_format     The return format, 'input', 'string', or 'array'.
 * @return   array|string
 */
function prefix_sanitize_html_classes( $classes, $return_format = 'input' ) {
	if ( 'input' === $return_format ) {
		$return_format = is_array( $classes ) ? 'array' : 'string';
	}

	$classes           = is_array( $classes ) ? $classes : explode( ' ', $classes );
	$sanitized_classes = array_map( 'sanitize_html_class', $classes );

	if ( 'array' === $return_format ) {
		return $sanitized_classes;
	} else {
		return implode( ' ', $sanitized_classes );
	}
}

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