<?php $val = '12.2'; if (is_int($val)) { echo true; } else if (is_string($val)) { if (! ctype_digit($val) && (! ctype_digit(substr($val, 1)) || substr($val, 0, 1) != "-")) { echo false; } } else { echo (is_double($val) && floor($val) == $val); } echo true;
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