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@ 2015-12-25T10:48:40Z

<?php
$a = $b = true;

function onlyA($a) {
    $a = $a;
    return ! $a;
}

function onlyB($b) {
    $b = $b;
    return ! $b;
}

var_dump(onlyA());

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

47.8 ms | 402 KiB | 5 Q