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@ 2016-04-28T19:09:38Z

<?php

function foo(&$foo, $bar) {
    $bar = explode(',', $bar);
    foreach ($bar as $baz) {
        $foo[$baz] = $baz;
    }
}

$foo = [];
foo($foo, '');
foo($foo, 'foo,bar');
foo($foo, '');

var_dump($foo);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
explode: documentation ( source)

preferences:dark modelive preview

89.75 ms | 402 KiB | 5 Q