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<?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>';
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
01<pre>Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [0] => 2 ) ) </pre>