WordPress: FILTER_SANITIZE_STRING for PHP8

filter-strip-all-tags.php

<?php

/**
 * Callback filter for filter_var_array() to strip HTML tags.
 *
 * @return array
 */
function filter_strip_all_tags() {
	return [
		'filter'  => FILTER_CALLBACK,
		'options' => '\wp_strip_all_tags',
	];
}

// Example Usage.
$get = filter_var_array(
	$_GET,
	[
		'string_param' => filter_strip_all_tags(),
	]
);

// Get sanitized string.
$param = $get['string_param'];