Encryption and decryption processing class implemented in PHP

this article will introduce you to the method of implementing encryption and decryption processing classes in php, and analyze the definition and usage skills of php encryption and decryption classes in the form of examples. it has certain reference value. friends in need can refer to it. i hope it will be helpful to everyone.

encryption and decryption processing class implemented by php

<?php
class SysCrypt {
 private $crypt_key;
 // 构造函数
 public function __construct($crypt_key) {
  $this -> crypt_key = $crypt_key;
 }
 public function php_encrypt($txt) {
  srand((double)microtime() * 1000000);
  $encrypt_key = md5(rand(0,32000));
  $ctr = 0;
  $tmp = '';
  for($i = 0;$i<strlen($txt);$i++) {
   $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
   $tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
  }
  return base64_encode(self::__key($tmp,$this -> crypt_key));
 }
 public function php_decrypt($txt) {
  $txt = self::__key(base64_decode($txt),$this -> crypt_key);
  $tmp = '';
  for($i = 0;$i < strlen($txt); $i++) {
   $md5 = $txt[$i];
   $tmp .= $txt[++$i] ^ $md5;
  }
  return $tmp;
 }
 private function __key($txt,$encrypt_key) {
  $encrypt_key = md5($encrypt_key);
  $ctr = 0;
  $tmp = '';
  for($i = 0; $i < strlen($txt); $i++) {
   $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
   $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
  }
  return $tmp;
 }
 public function __destruct() {
  $this -> crypt_key = null;
 }
 }
 //执行代码
 $sc = new SysCrypt('phpwms');
 $text = 'abc10000008910000000990099hh'; //需要加密的数据
 print($sc -> php_encrypt($text)); //加密
 print('<br>');
 print($sc -> php_decrypt($sc -> php_encrypt($text))); //解密
?>

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