[PHP] PHP7中对十六进制字符串处理的问题详解

$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11"));
var_dump($t1,$t2);

int(364129809)
int(364129809)

int(364129809)
int(0)

<?php
$str = "0xffff";
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
if (false === $int) {
  throw new Exception("Invalid integer!");
}
var_dump($int); // int(65535)
?>

$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));
var_dump($t1,$t2);