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