我正在做一個項目，您可以在其中創建一個帳戶，使用 php 和 mysql 服務器登錄并統一保存用戶數據。我完成了所有注冊過程并且有效，但我無法登錄。我是按照 boardtobits 教程來做的。經過一些研究，我發現創建帳戶時生成的哈希值和登錄哈希值不同，但為什么呢？PHP 代碼 - （用于登錄）<?php $user = 'root'; $password = 'root'; $db = 'hostalvillegadata'; $host = 'localhost'; $port = 8889; $link = mysqli_init(); $success = mysqli_real_connect( $link,  $host,  $user,  $password,  $db, $port);//check that connection happenedif (mysqli_connect_errno()) {echo "1: Connection failed"; //error code #1 = connection failedexit();}$username = $_POST["name"];$password = $_POST["password"];//check if name exists$namecheckquery = "SELECT username, salt, hash, habitacionesreservadas FROM hostalvillegatable WHERE username='" .$username. "';";$namecheck = mysqli_query($link, $namecheckquery) or die("2: Name check query failed"); // error code #2 - name check query failedif (mysqli_num_rows($namecheck) != 1 ) { echo "5: No user with name, or more than one"; //error code #5 - number  of names matching != 1 exit(); } //get login info from query $existinginfo = mysqli_fetch_assoc($namecheck); $salt = $existinginfo["salt"]; $hash = $existinginfo["hash"]; $loginhash = crypt($password, $salt);  if ($hash != $loginhash)   {    echo "6: Incorrect password"; //error code #6 - password does not     hash to match table    exit();   }    echo "0\t" . $existinginfo["habitacionesreservadas"];   ?>