wp_kses_no_null() WordPress Function

The wp_kses_no_null() function is a security measure to prevent cross-site scripting (XSS) attacks. It strips out any characters that are not alphanumeric, including whitespace, and replaces them with an empty string. This function should be used whenever data from untrusted sources is used in the WordPress code.

wp_kses_no_null( string $string, array $options = null ) #

function wp_kses_no_null( $string, $options = null ) {
	if ( ! isset( $options['slash_zero'] ) ) {
		$options = array( 'slash_zero' => 'remove' );
	}

	$string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string );
	if ( 'remove' === $options['slash_zero'] ) {
		$string = preg_replace( '/\\\\+0+/', '', $string );
	}

	return $string;
}