Online PHP editor | refs for IiJ6U

<?php $vars = [ 'TRUE' => TRUE, 'FALSE' => FALSE, '1' => 1, '0' => 0, '-1' => -1, '"1"' => "1", '"0"' => "0", '"-1"' => "-1", 'NULL' => NULL, 'array()' => array(), '"php"' => "php", '""' => "", ]; foreach ($vars as $label => $var) { $result = (!$var === empty($var)) ? 'TRUE' : 'FALSE'; echo sprintf("%s: %s\n", $label, $result); }