PHP7中對十六進制字符串處理的問題詳解

本篇文章由PHP7教程欄目給大家介紹一下關於 php7 中 "0xFFFFFFFF" 和 0xFFFFFFFF 的問題。有一定的參考價值，有需要的朋友可以參考一下，希望對大家有所幫助。

具體問題：

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

以上代碼在 php7（不含）以下平台的值為：

int(364129809)int(364129809)

而在 php7的值為：

int(364129809)int(0)

請問，在 php7的環境下，應該如何處理 0x.$str 使它同上面值一樣呢？

解決辦法：

PHP7開始，含十六進制字符串不再被認為是數字

如果非要檢測字符串是否含十六進制數字，官方建議的代碼是

<?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)?>

針對上述問題就應該改成

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

到此這篇關於PHP7中對十六進制字符串處理的問題詳解的文章就介紹到這了，希望大家以後多多支持好二三四！

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