PHP 產生唯一的啟用碼

標籤：php啟用碼   php產生唯一的啟用碼   

<?php/** * 產生永遠唯一的啟用碼 * @return string */function create_guid($namespace = null) {static $guid = '';$uid = uniqid ( "", true );$data = $namespace;$data .= $_SERVER ['REQUEST_TIME']; // 請求那一刻的時間戳記$data .= $_SERVER ['HTTP_USER_AGENT']; // 擷取訪問者在用什麼作業系統$data .= $_SERVER ['SERVER_ADDR']; // 伺服器IP$data .= $_SERVER ['SERVER_PORT']; // 連接埠號碼$data .= $_SERVER ['REMOTE_ADDR']; // 遠程IP$data .= $_SERVER ['REMOTE_PORT']; // 連接埠資訊$hash = strtoupper ( hash ( 'ripemd128', $uid . $guid . md5 ( $data ) ) );$guid = '{' . substr ( $hash, 0, 8 ) . '-' . substr ( $hash, 8, 4 ) . '-' . substr ( $hash, 12, 4 ) . '-' . substr ( $hash, 16, 4 ) . '-' . substr ( $hash, 20, 12 ) . '}';return $guid;}//使用echo $key = create_guid ();