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@ 2016-12-22T13:03:54Z

<?php

$a = [
    '$'  => 'foo',
    '$a' => 'bar'
];

var_dump(
    $a["$"],
    $a["$a"],
    $a['$a']
);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

54.2 ms | 402 KiB | 5 Q