How to perform md5 encryption in php

DirectlyYou canuse the md5() function to encrypt the content, such as: md5($admin_pw).

Divide this ciphertext into several segments, perform an MD5 operation on each segment, then concatenate this pile of ciphertext into a very long string, and finally perform another MD5 operation. The resulting ciphertext is still 32 bits in length. (Recommended learning: PHP programming from entry to proficiency)

<?php
//把密文分割成两段，每段16个字符
function md5_2_1($data)
{
//先把密码加密成长度为32字符的密文
$data = md5($data);
//把密码分割成两段
$left = substr($data, 0, 16);
$right = substr($data, 16, 16);
//分别加密后再合并
$data = md5($left).md5($right);
//最后把长字串再加密一次，成为32字符密文
return md5($data);
}
//把密文分割成32段，每段1个字符
function md5_2_2($data)
{
$data = md5($data);
//循环地截取密文中的每个字符并进行加密、连接
for ($i = 0; $i < 32; $i++) {
$data .= md5($data{$i});
}
//这时$data长度为1024个字符，再进行一次MD5运算
return md5($data);
}
?>

The above is the detailed content of How to perform md5 encryption in php. For more information, please follow other related articles on the PHP Chinese website!