<?php foreach(['-1', '0', '1', '1e10', 'a', 'hello', 1, -1, 0, true, false, 1.0, 0.0, 1.3] as $s) { var_dump($s); var_dump(ctype_digit($s)); $arr[$s] = 1; var_dump(array_key_first($arr)); echo "\n"; }
You have javascript disabled. You will not be able to edit any code.