- var_dump: documentation ( source)
- json_decode: documentation ( source)
- print_r: documentation ( source)
- var_export: documentation ( source)
- json_encode: documentation ( source)
<?php
$a = function(){echo 'hi';};
var_dump($a);
var_export($a);
print_r($a);
echo json_encode($a);
echo json_decode($a);