pushing values in array ??

[PHPycho]

Hello forums !!
I would like to push the values in array(without specifying index).
Can anybody give me the suggestion.
Note: It should be equivalent to PHP's

$exp_array = array();
$exp_array[] = "value1";
$exp_array[] = "value2"; 

(without specifying indexes)
...........etc

Thanks in advance to all of you.