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@ 2015-04-16T02:08:30Z

<?php

var_dump(sqrt(-1));
var_dump(NAN == true);
var_dump(NAN === true);

gettype(NAN);
empty(NAN);
is_null(NAN);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
sqrt: documentation ( source)

preferences:dark modelive preview

57.86 ms | 402 KiB | 5 Q