PHP如何实现加密解密处理类的编写？

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phpclass SysCrypt{ private $crypt_key;

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)); }}

<?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; } } $sc = new SysCrypt('phpwms'); $text = '110'; print($sc -> php_encrypt($text)); print('<br>'); print($sc -> php_decrypt($sc -> php_encrypt($text))); ?>