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@ 2014-04-24T19:08:03Z

<?php
$a = 'a';
$b = 'b';
echo (isset ($a) && isset ($b) && !is_numeric (($a * $b) . '') ) && (($a * $b) != INF) ? 1 : 0;
?>

Output
Performance
VLD
References
Branches

is_numeric: documentation ( source)

preferences:dark modelive preview

34.84 ms | 402 KiB | 5 Q