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@ 2017-07-13T08:12:02Z

<?php

function test($b){
    if(empty($b)){
        var_dump($b);    
    }
}

test(null);
test();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

42.33 ms | 402 KiB | 5 Q