本文实例讲述了php加密解密方法。分享给大家供大家参考，具体如下：
//加密function string2secret($str){ $key = 123; $td = mcrypt_module_open(mcrypt_des,'','ecb',''); $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), mcrypt_rand); $ks = mcrypt_enc_get_key_size($td); $key = substr(md5($key), 0, $ks); mcrypt_generic_init($td, $key, $iv); $secret = mcrypt_generic($td, $str); mcrypt_generic_deinit($td); mcrypt_module_close($td); return $secret;}//解密function secret2string($sec){ $key = 123; $td = mcrypt_module_open(mcrypt_des,'','ecb',''); $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), mcrypt_rand); $ks = mcrypt_enc_get_key_size($td); $key = substr(md5($key), 0, $ks); mcrypt_generic_init($td, $key, $iv); $string = mdecrypt_generic($td, $sec); mcrypt_generic_deinit($td); mcrypt_module_close($td); return trim($string);}echo secret2string(string2secret(11111111111111111));//显示结果是11111111111111111echo '
'.string2secret(11111111111111111);//显示乱码echo '
';//$string:要加密的字符串 $isencrypt=true:加密 $isencrypt=false:解密function dencrypt($string, $isencrypt = true, $key = key_space) { if (!isset($string{0}) || !isset($key{0})) { return false; } $dynkey = $isencrypt ? hash('sha1', microtime(true)) : substr($string, 0, 40); $fixedkey = hash('sha1', $key); $dynkeypart1 = substr($dynkey, 0, 20); $dynkeypart2 = substr($dynkey, 20); $fixedkeypart1 = substr($fixedkey, 0, 20); $fixedkeypart2 = substr($fixedkey, 20); $key = hash('sha1', $dynkeypart1 . $fixedkeypart1 . $dynkeypart2 . $fixedkeypart2); $string = $isencrypt ? $fixedkeypart1 . $string . $dynkeypart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40))); $n = 0; $result = ''; $len = strlen($string); for ($n = 0; $n 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);}echo strlen(dencrypt(12345678912345));
希望本文所述对大家php程序设计有所帮助。
以上就介绍了php加密解密实例分析，包括了方面的内容，希望对php教程有兴趣的朋友有所帮助。