关于 php7 中 "0xFFFFFFFF" 和 0xFFFFFFFF 的问题
<code>$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11)); $t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11")); var_dump($t1,$t2);</code>
以上代码在 php7(不含)以下平台的值为:
<code>int(364129809) int(364129809)</code>
而在 php7的值为:
<code>int(364129809) int(0)</code>
请问,在 php7的环境下,应该如何处理 0x.$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,$t2);</code>
以上代码在 php7(不含)以下平台的值为:
<code>int(364129809) int(364129809)</code>
而在 php7的值为:
<code>int(364129809) int(0)</code>
请问,在 php7的环境下,应该如何处理 0x.$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>
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>

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