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@ 2016-12-02T16:36:57Z

<?php

function rechne(?string $test): ?int {
    if ($test) {
        return 0;
    } else {
        return null;
    }
}

var_dump(rechne(null));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

54.4 ms | 402 KiB | 5 Q