<"INSERT INTO user(username,password) VALUES('{$username}','{$password}')";
  $result=mysqli_query($link, $sql);
  
  if ($result) {
    echo "Success";
    echo "<meta http-equiv='refresh' content='1;url=login.html'/>";
  }else {
    echo "Failure!";
    echo "<meta http-equiv='refresh' content='1;url=reg.html'/>";
  }
}elseif ($act=='login') {
  $sql="SELECT * FROM user WHERE username='{$username}' AND password='{$password}'";
  $result=mysqli_query($link, $sql);
  $validate=mysqli_fetch_array($result);
  //var_dump($validate);
  if ($validate) {
    echo "success";
    echo "<meta http-equiv='refresh' content='1;url=http://www.baidu.com'/>";
  }else {
    echo "failure";
    echo "<meta http-equiv='refresh' content='1;url=login.html'/>";
  }
}

mysql> SELECT * FROM user;
+----+----------+----------------------------------+
| id | username | password             |
+----+----------+----------------------------------+
| 1 | 123   | d41d8cd98f00b204e9800998ecf8427e |
| 2 | 123   | 5e12a8f9c9e959060fdcaea165393039 |
| 3 |     | d41d8cd98f00b204e9800998ecf8427e |
| 4 | root   | 202cb962ac59075b964b07152d234b70 |
| 5 | root   | 0c51f0ba4316a5c844397f69effe2d01 |
+----+----------+----------------------------------+

/**
 * Crypt
 */
echo crypt('shit');
echo "<hr/>";
echo crypt('shit','im');
echo "<hr/>";
if (CRYPT_EXT_DES) {
  echo crypt('shit','this is a test');
}
echo "<hr/>";
if (CRYPT_MD5) {
  echo crypt('shit','$1$this is a test$');
}

1223b8c30a347321299611f873b449ad
$1$ed0.Ph..$fPbfhSOMLyNdtZn9krT8X/
im37cLeO/JPaQ
th12A1V7QCns.
$1$this is $Bu9FE8Y8oGnIbftjDA4ez0

/**
 * Sha1
 */
echo "<hr/>";
echo sha1('shit');
echo "<hr/>";
echo sha1('shit',true);  
echo "<hr/>";
echo sha1('admin');

echo "<hr/>";
echo sha1(sha1('admin',true));
echo "<hr/>";
echo sha1(md5('admin'));

/**
 * URL编码加密
 */

$str="this is a test";
$result=urlencode($str);
echo $result;
echo "<hr/>";
echo urldecode($result);
echo "<hr/>";
$str="login.php";
echo urlencode($str);
echo "<hr/>";

echo "<a href='index.php";
print_r($_GET);
echo "<hr/>";
//所以地址栏进行一下编码，一方面是保密，一方面是处理特殊情况
//比如username&shit是一个整体，不编码的话，浏览器是看不出的
echo "<a href='index.php";
print_r($_GET);
echo "<hr/>";
$str="username&shit";
$str2="username=".urlencode($str)."&gender=".urlencode("male");
echo "<a href='index.php".$str2."'>Shit Login3</a>";
print_r($_GET);
echo "<hr/>";
//baidu example
//https://www.baidu.com/s"htmlcode">

this+is+a+test
this is a test
login.php%3Fusername%3Dshit%26action%3Dact%253+hape%23123%5C
Shit LoginArray ( [username] => username&shit [gender] => male ) 
Shit Login2Array ( [username] => username&shit [gender] => male ) 
Shit Login3Array ( [username] => username&shit [gender] => male ) 


所以功能就是：地址栏更加安全，不再明文传输，另一个解决特殊情况的传递
五、Base64编码加密
其实base64不是加密技术，只不过他会对data进行base64的编码，也可以看做是一种加密技术；


/**
 * Base64
 */

$data="I am king";
echo base64_encode($data);
echo "<hr/>";
echo base64_decode(base64_encode($data));
echo "<hr/>";
echo base64_encode("中文测试");
echo "<hr/>";
// echo base64_decode("R0lGODlhAQABAIAAAP///wAAACH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==");
$data=file_get_contents("0.jpg");
echo base64_encode($data);


 等于说是对内容进行加密；
总结
单项散列加密：得到固定长度的输出，是单向的；
对称散列加密：使用同一把密钥进行加密解密，可以相互推算；（算法简单，效率高，开销小，适合对大量数据进行加密）DES等
非对称加密技术：密钥不一样，公钥和私钥之分
以上这篇PHP加密技术的简单实现就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。