我已經(jīng)為登錄和數(shù)據(jù)庫制作了一個 PHP 文件，但不斷出現(xiàn)錯誤致命錯誤：Uncaught Error: Call to undefined function mysql_real_escape_string() in C:\wamp64\www\Login\process.php on line 15錯誤：在第 15 行調(diào)用 C:\wamp64\www\Login\process.php 中未定義的函數(shù) mysql_real_escape_string()代碼開始<?php   // to get values passe from form in login.php file  $username = $POST['username']  $password = $POST['password']    // to prevent mysql injection  $username = stripcslashes($username);  $password = stripcslashes($password);  $username = mysql_real_escape_string($username);  $password = mysql_real_escape_string($username);  //connect to the server select database  mysql_connect("localhost", "root", "");  mysql_select_db("login");  // Query the database for user  $result = mysql_query("select * from users where username = '$username' and password = '$password'")    or die('Failed to query database'.mysql_error());  $row = mysql_fetch_array($result);  if ( $row['username'] == $username && $row['password'] == $password ){      echo "login success! Welcome".$row['username'];  } else {    echo "Failed to login!";}?>