WordPress at a glance
function is not described

wp_kses_attr_check() WP 4.2.3

Determine whether an attribute is allowed.

  • Since 5.0.0 Add support for data-* wildcard attributes.

No Hooks.

Return

true/false. Is the attribute allowed?

Usage

wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html );
$name(string) (required)
The attribute name. Returns empty string when not allowed.
$value(string) (required)
The attribute value. Returns a filtered value.
$whole(string) (required)
The name=value input. Returns filtered input.
$vless(string) (required)
'y' when attribute like "enabled", otherwise 'n'.
$element(string) (required)
The name of the element to which this attribute belongs.
$allowed_html(array) (required)
The full list of allowed elements and attributes.

Code of wp kses attr check: wp-includes/kses.php VER 5.0.3

<?php
function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
	$allowed_attr = $allowed_html[ strtolower( $element ) ];

	$name_low = strtolower( $name );

	if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
		/*
		 * Allow `data-*` attributes.
		 *
		 * When specifying `$allowed_html`, the attribute name should be set as
		 * `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see
		 * https://www.w3.org/TR/html40/struct/objects.html#adef-data).
		 *
		 * Note: the attribute name should only contain `A-Za-z0-9_-` chars,
		 * double hyphens `--` are not accepted by WordPress.
		 */
		if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) {
			/*
			 * Add the whole attribute name to the allowed attributes and set any restrictions
			 * for the `data-*` attribute values for the current element.
			 */
			$allowed_attr[ $match[0] ] = $allowed_attr['data-*'];
		} else {
			$name = $value = $whole = '';
			return false;
		}
	}

	if ( 'style' == $name_low ) {
		$new_value = safecss_filter_attr( $value );

		if ( empty( $new_value ) ) {
			$name = $value = $whole = '';
			return false;
		}

		$whole = str_replace( $value, $new_value, $whole );
		$value = $new_value;
	}

	if ( is_array( $allowed_attr[ $name_low ] ) ) {
		// there are some checks
		foreach ( $allowed_attr[$name_low] as $currkey => $currval ) {
			if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
				$name = $value = $whole = '';
				return false;
			}
		}
	}

	return true;
}