Case analysis of encryption and decryption functions in php

This article brings you a case analysis of the encryption and decryption functions in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

php’s own encryption function
Irreversible encryption functions are: md5(), crypt()
md5() is used to calculate MD5 hash. The syntax is: string md5(string str);
crypt() Encrypt the string using UNIX's standard encryption DES module. This is a one-way encryption function and cannot be decrypted. To compare strings, place the first two characters of the encrypted string in the salt parameters, and then compare the encrypted string. The syntax is: string crypt(string str, string [salt]);

The reversible encryption is: base64_encode(), urlencode() and the corresponding decryption function: base64_decode(), urldecode()
base64_encode() Encode the string in MIME BASE64. This encoding method allows Chinese text or pictures to be transmitted smoothly over the Internet. The syntax is string base64_encode(string data); Its decryption function is: string base64_decode(string encoded_data); will revert to the original.
urlencode() URL-encodes a string. For example, spaces will become plus signs. The syntax is: string urlencode(string str);

Its decryption function is: string urldecode(string str); It will return to the original state

php encryption and decryption function case code:

<?php  
  
define(&#39;str&#39;,&#39;moqiang02@sina.com&#39;);  
  
echo &#39;md5 加密后的结果为：&#39;.md5(str).&#39;<br>&#39;;//md5 加密  
  
echo &#39;crypt加密后的结果为：&#39;.crypt(str,str).&#39;<br>&#39;;// crypt加密  
  
$base64encode=base64_encode(str);// base64_encode() 加密  
  
echo &#39;base64_encode加密后的结果为：&#39;.$base64encode.&#39;<br>&#39;;  
  
echo &#39;base64_decode解密后的结果为：&#39;.base64_decode($base64encode).&#39;<br>&#39;; //base64_decode()解密  
  
$urlencode=urlencode(str);  //urlencode() 加密  
  
echo &#39;urlencode加密后的结果为：&#39;.$urlencode.&#39;<br>&#39;;  
  
echo &#39;urldecode解密后的结果为：&#39;.urldecode($urlencode).&#39;<br>&#39;;//urldecode() 解密  
  
?>

Output:

md5 The encrypted result is: 0c4cf10f2e489a6e6482db13dfafaab8
crypt The encrypted result is: moMaPvME.49dQ
base64_encode The encrypted result is: bW9xaWFuZzAyQHNpbmEuY29t
base64_decode The decrypted result is: moqiang02@sina.com
urlencode The encrypted result is: moqiang02@sina.com
urldecode The decrypted result is: moqiang02@sina.com

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PHP decrypts Unicode and Escape encrypted strings, unicodeescape

##php encryption and decryption

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