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<?php function parseIntOrException($val) { $int = (int)$val; if ((string)$int === (string)$val) { return FALSE; } return $int; } $result = array(); foreach (array(1, '2', '3.0', 4.0, 5, '0') as $x) { $result[var_export($x, TRUE)] = var_export(parseIntOrException($x), TRUE); } print_r($result);