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@ 2015-05-04T10:03:51Z

<?php

class First {
    
}

class Second extends First {
    
}

function x(First $f) {
    var_dump($f);
}

x(new Second());

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

32.74 ms | 402 KiB | 5 Q