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用于32位的unsigned int数据加密解密
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| <?php | |
| function api_encode_uid($uid) | |
| { | |
| $sid = ($uid & 0x0000ff00) << 16; | |
| $sid += (($uid & 0xff000000) >> 8) & 0x00ff0000; | |
| $sid += ($uid & 0x000000ff) << 8; | |
| $sid += ($uid & 0x00ff0000) >> 16; | |
| $sid ^= 282335; | |
| return $sid; | |
| } | |
| function decode($int) | |
| { | |
| $result = 0; | |
| $int ^= 282335; | |
| $result += (($int & 0xff000000) >> 16) & 0x0000ff00; | |
| $result += ($int & 0x00ff0000) << 8; | |
| $result += (($int & 0x0000ff00) >> 8); | |
| $result += ($int & 0x000000ff) << 16; | |
| return $result; | |
| } | |
| $id = 1024; | |
| echo 'raw:', dechex($id); | |
| echo '<br>'; | |
| $a = api_encode_uid($id); | |
| echo '<br>'; | |
| $b = decode($a); | |
| echo "<br>"; | |
| echo 'result:', dechex($b); |
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