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Home Backend Development PHP Tutorial 关于 php7 中 "0xFFFFFFFF" 和 0xFFFFFFFF 的问题

关于 php7 中 "0xFFFFFFFF" 和 0xFFFFFFFF 的问题

Jun 06, 2016 pm 08:13 PM
php

<code>$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11"));

var_dump($t1,$t2);</code>
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以上代码在 php7(不含)以下平台的值为:

<code>int(364129809)
int(364129809)</code>
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Copy after login

而在 php7的值为:

<code>int(364129809)
int(0)</code>
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Copy after login

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?

回复内容:

<code>$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11"));

var_dump($t1,$t2);</code>
Copy after login
Copy after login

以上代码在 php7(不含)以下平台的值为:

<code>int(364129809)
int(364129809)</code>
Copy after login
Copy after login

而在 php7的值为:

<code>int(364129809)
int(0)</code>
Copy after login
Copy after login

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?

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

<code><?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)
?></code>
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针对你的问题就应该改成

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

var_dump($t1,$t2);</code>
Copy after login
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