- var_dump: documentation ( source)
- error_reporting: documentation ( source)
<?php
error_reporting(E_ALL);
$b = array();
var_dump($b['foo']);
$b = null;
var_dump($b['foo1']);
$b = "string";
var_dump($b['foo2']);
$b = 345678;
var_dump($b['foo3']);
unset($b['hoihoi']);