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php校验数据有关问题

Jun 13, 2016 am 10:10 AM
php quot str

php校验数据问题

PHP code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$str3 = $str1.$str2;//现在只知道$str1的校验值和 $str2的内容还有校验值//用crc32校验怎么算出来$str3的校验值 
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------解决方案--------------------
没办法,从数据特征值、循环冗余校验码是没办法逆运算原数据的。。128位、512或者32位不可能表示无穷多的数据
PHP code
var_dump(crc32("86821"), crc32("14740600"));<br><font color="#e78608">------解决方案--------------------</font><br>可能的!<br><br>CRC 算法可参考 http://blog.csdn.net/sparkliang/article/details/5671510 说的比较清楚<br><br>你可将 $str1的校验值 作为基值,继续对 $str2的内容 进行运算<div class="clear">
                 
              
              
        
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