- assert: documentation ( source)
- array_push: documentation ( source)
- var_dump: documentation ( source)
- array_pop: documentation ( source)
<?php
$b=array(-1=>0);
$c=array_pop($b); assert($c == 0);
assert(array_push($b, 0), 1);
assert(array_push($b, 0), 2);
var_dump($b);
assert(array_push($b, 0), 3);
?>