<?php session_start();if(isset($_SESSION["user_name"]))if($_GET["destroy"]=="yes"){unset($_SESSION["user_name"]);session_destroy();}if(!isset($_SESSION["user_name"]) &&$_GET["user"]!="")$_SESSION["user_name"] = $_GET["user"];?><html><head><title>Session Example</title></head><body>Welcome <?php echo $_SESSION["user_name"]; ?><form action="#">Input your name here: <input type=text name=user><input type=submit value=Submit></form><form action="#"><input type=hidden value=yes name=destroy><input type=submit value="Destroy Previous Session"></form></body></html>在上面，有两行“ unset（$ SESSION [“ username”]）; session_destroy（）;“ 当我删除“ session_destroy（）;”时 支付与拥有相同。没必要吗？谁能解释这个，任何提示将不胜感激。
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