PHP加密解密实例分析

'.string2secret("22222222222222211"); //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,40); $fixedKey = hash('sha1',$key); $dynKeyPart1 = substr($dynKey,20); $dynKeyPart2 = substr($dynKey,20); $fixedKeyPart1 = substr($fixedKey,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 < $len; $n++) { $result .= chr(ord($string{$n}) ^ ord($key{$n % 40})); } return $isEncrypt ? $dynKey . str_replace('=',base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result,20,-20); } echo strlen(dencrypt("12345678912345"));