本篇文章由PHP7教程栏目给大家介绍一下关于 php7 中 "0xFFFFFFFF" 和 0xFFFFFFFF 的问题。有一定的参考价值，有需要的朋友可以参考一下，希望对大家有所帮助。
具体问题：
$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));$t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11"));var_dump($t1,$t2);
以上代码在 php7（不含）以下平台的值为：
int(364129809)int(364129809)
而在 php7的值为：
int(364129809)int(0)
请问，在 php7的环境下，应该如何处理 0x.$str 使它同上面值一样呢？
解决办法：
PHP7开始，含十六进制字符串不再被认为是数字
如果非要检测字符串是否含十六进制数字，官方建议的代码是
<?php$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)?>针对上述问题就应该改成
$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));$t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));var_dump($t1,$t2);到此这篇关于PHP7中对十六进制字符串处理的问题详解的文章就介绍到这了，希望大家以后多多支持好二三四！
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