- var_dump: documentation ( source)
- print_r: documentation ( source)
<?php
class A { public $a; }
class B extends A { public $b; }
$a = new B(); $a->a = 0; $a->b = 1;
$b = new B(); $b->a = 1; $b->b = 0;
var_dump($a < $b);
print_r($a, true);
var_dump($a < $b);