数据加密的基本原理就是对原来的明文的文件或数据按某种算法进行处理，使其成为不可读的一定代码，通常称为“密文”，通过这样的途径来达到保护数据不被非法窃取和阅读目的。 PHP加密的函数主要有：crypt()、md5()和sha1()函数，还有加密的拓展库Mcrypt和Mas
数据加密的基本原理就是对原来的明文的文件或数据按某种算法进行处理，使其成为不可读的一定代码，通常称为“密文”，通过这样的途径来达到保护数据不被非法窃取和阅读目的。
PHP加密的函数主要有：crypt()、md5()和sha1()函数，还有加密的拓展库Mcrypt和Mash。这里主要介绍：crypt()、md5()和sha1()
PHP相关代码：
<?php //crypt()函数加密
$content="12345678";
echo '加密前$content的值为：'.$content."<br/>";
$crypt=crypt($content);
echo '加密后$crypt的值为：'.$crypt."<br>";
echo"<br>";
//md5()函数加密
$md5="12345678";
echo '加密前$md5的值为：'.$md5."<br>";
$md5s=md5($md5);
echo '加密后$md5s的值为：'.$md5s."<br>";
echo"<br>";
//sha1()函数加密
$sha1="12345678";
echo '加密前$sha1的值为：'.$sha1."<br>";
$sha1s=sha1($sha1);
echo '加密后$sha1s的值为：'.$sha1s."<br>";
?>
结果展示：
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