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@ 2013-01-29T15:19:37Z

<?php

var_dump(is_numeric(null));
var_dump(is_numeric(INF));
var_dump(is_numeric(NAN));
var_dump(is_numeric(-INF));
var_dump(is_numeric(123));
var_dump(is_numeric('qweffwqe'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_numeric: documentation ( source)

preferences:dark modelive preview

32.87 ms | 402 KiB | 5 Q