https://leetcode.com/problems/reverse-integer/
class Solution {
function reverse($x) {
$symbol = 1;
if ($x < 0) $symbol = -1;
$int = $x * $symbol;
$int = strrev($int) * $symbol;
if ($int > pow(2, 31) or $int < pow(2, 31)*-1) {
return 0;
}
else {
return $int;
}
}
}
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