本文实例讲述了php结合md5的加密解密算法。分享给大家供大家参考，具体如下：
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<?php
/*
* Created on 2016-9-30
*
*/
function encrypt($data, $key)
{
$key = md5($key);
$x = 0;
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++)
{
if ($x == $l)
{
$x = 0;
}
$char .= $key{$x};
$x++;
}
for ($i = 0; $i < $len; $i++)
{
$str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
}
return base64_encode($str);
}
function decrypt($data, $key)
{
$key = md5($key);
$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++)
{
if ($x == $l)
{
$x = 0;
}
$char .= substr($key, $x, 1);
$x++;
}
for ($i = 0; $i < $len; $i++)
{
if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
{
$str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
}
else
{
$str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
}
}
return $str;
}
$data = '服务器之家www.zzvips.com'; // 被加密信息
$data=iconv("gbk","utf-8",$data);
$key = 'www.zzvips.com'; // 密钥
$encrypt = encrypt($data, $key);
$decrypt = decrypt($encrypt, $key);
echo $encrypt, "<br/>", $decrypt;
?>
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运行结果如下：
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TrXMTM8SFB3DGhTr2qeuYqOXZmpmn8mo
服务器之家www.zzvips.com
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希望本文所述对大家PHP程序设计有所帮助。