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@ 2018-07-09T16:36:06Z

<?php

function f($a, $b = 'default') {
    var_dump($a, $b);
    echo PHP_EOL;
}

f('hi');
f('hi', null);

Output
Performance
VLD
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var_dump: documentation ( source)

preferences:dark modelive preview

47.51 ms | 405 KiB | 6 Q