关于php中intval在32和64位的问题
php的int行在32位的系统上是4Byte，在64位上是8Byte，导致在超过4Byte的整数，在32和64返回的结果不同，现在写一个统一的函数，统一用32位的算法
function intval32($num) {
$num = $num & 0xffffffff;//消掉高32位
$p = $num>>31; //取第一位 判断是正数还是负数
if($p==1) { //负数
$num = $num-1;
$num = ~$num; //取反 会当成64位取反,算出来的数就去了,所以取反之后 要消掉 高32位
$num = $num & 0xffffffff;
return $num * -1;
} else {
return $num;
}
}
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