As¶

The as operator has several usage:

It is an optional keyword with the foreach() control structure, to access the key of the looped array
It is an optional keyword with the use expression, in trait import
It is an optional keyword with the use expression, in namespace import

The as operator often works to give a distinct name to an existing structure.

<?php

    use stdClass as StandardClass;

    foreach($map as $key => $value) {
        print "$key => $value\n";
    }

?>