- array_push: documentation ( source)
- print_r: documentation ( source)
- str_pad: documentation ( source)
<?php
echo str_pad(01, 2, "0", STR_PAD_LEFT);
$arr=array();
array_push($arr, array(1));
array_push($arr, array(2));
echo '<pre>';
print_r($arr);
echo '</pre>';