Flush WP object cache, prevent memory limit

global $wpdb, $wp_actions;
$wpdb->queries = array();
$wp_actions = array();
wp_cache_flush();

sanitize input

$my_string = filter_input(INPUT_GET, ‘my_string’, FILTER_SANITIZE_STRING);

ob_start();
var_dump($param);
$param_vd = ob_get_clean();