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求解 crc32()函数的施用场景

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Jun 13, 2016 am 11:08 AM

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求解 crc32()函数的应用场景
求解 crc32()函数的应用场景，看手册以后很迷茫，不知道这个函数有什么用途，求解。能给出一个应用场景最好
------解决方案--------------------
手册描述：生成 str 的 32 位循环冗余校验码多项式。这通常用于检查传输的数据是否完整。
今天第一次看到这个函数，试用了一下，感觉就像验DNA一样。
实际上我们在做数据传输的过程中，很多时候要给数据一层一层的包装，再一层一层地拆开包装，这个过程中，很可能数据就“变质”了。我有一次就是这样,数据打包，传输，再按打包规则还原结果就不一样了。我gettype出来的值是一样的 print_r出来也是一样的后面是用strlen看到打包前是6 还原就是192了很是郁闷就蒙着trim去掉空格试试才变成原本那样。如果当时认识这个crc32()比较一下应该很快看出问题
个人一点经验，分享给LZ ，继续学习！
------解决方案--------------------
CRC32 校验和
通常用于可靠性较高的数据传输中。

由于校验和是按位运算的结果，所以不同的数据可能有相同的校验和

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