本文實例講述了PHP登錄驗證功能。分享給大家供大家參考，具體如下：
登錄界面
具體實現方法如下：
login.html
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body><form method="post" action="doLogin.php"> <input type="text" placeholder="用戶名" name="username"><br><br> <input type="password" placeholder="密碼" name="password"><br><br> <input type="text" placeholder="驗證碼" name="verifycode" class="captcha"><br><br> <img id="captcha_img" src="captcha.php?r=<?php echo rand();?>" <label><a href="javascript:void(0)" rel="external nofollow" onclick="document.getElementById('captcha_img').src='captcha.php?r='+Math.random()">換一個</a> </label><br> <label><input type="checkbox" name="autologin[]" value="1"/>自動登錄</label><br> <button type="submit">登錄</button></form></body></html>doLogin.php
<?phpheader("Content-type:text/html;charset=UTF-8");require "mysql.php"; //導入mysql.php訪問數據庫session_start(); //開啟會話一獲取到服務器端驗證碼$username=$_POST['username'];$password=$_POST['password'];$autologin=isset($_POST['autologin'])?1:0; //獲取是否選擇了自動登錄$verifycode=$_POST['verifycode'];$code=$_SESSION['code']; //獲取服務器生成的驗證碼/* * 首先進行判空操作，通過后進行驗證碼驗證，通過后再進行數據庫驗證。 * 手機號碼和郵箱驗證可根據需要自行添加 * */if(checkEmpty($username,$password,$verifycode)){ if(checkVerifycode($verifycode,$code)){ if(checkUser($username,$password)){ $_SESSION['username']=$username; //保存此時登錄成功的用戶名 if($autologin==1){ //如果用戶勾選了自動登錄就把用戶名和加了密的密碼放到cookie里面 setcookie("username",$username,time()+3600*24*3); //有效期設置為3天 setcookie("password",md5($password),time()+3600*24*3); } else{ setcookie("username","",time()-1); //如果沒有選擇自動登錄就清空cookie setcookie("password","",time()-1); } header("location: index.php "); //全部驗證都通過之后跳轉到首頁 } }}//方法：判斷是否為空function checkEmpty($username,$password,$verifycode){ if($username==null||$password==null){ echo '<html><head><Script Language="JavaScript">alert("用戶名或密碼為空");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">"; } else{ if($verifycode==null){ echo '<html><head><Script Language="JavaScript">alert("驗證碼為空");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">"; } else{ return true; } }}//方法：檢查驗證碼是否正確function checkVerifycode($verifycode,$code){ if($verifycode==$code){ return true; } else{ echo '<html><head><Script Language="JavaScript">alert("驗證碼錯誤");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">"; }}//方法：查詢用戶是否在數據庫中function checkUser($username,$password){ $conn=new Mysql(); $sql="select * from user where name='{$username}' and password='{$password}';"; $result=$conn->sql($sql); if($result){ return true; } else{ echo '<html><head><Script Language="JavaScript">alert("用戶不存在");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">"; } $conn->close();}//方法：手機格式驗證function checkPhoneNum($phonenumber){ $preg="/^1[34578]{1}/d{9}$/"; if(preg_match($preg,$phonenumber)){ return ture; //驗證通過 }else{ echo '<html><head><Script Language="JavaScript">alert("手機號碼格式有誤");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">";//手機號碼格式不對 }}//方法：郵箱格式驗證function checkEmail($email){ $preg = '/^(/w{1,25})@(/w{1,16})(/.(/w{1,4})){1,3}$/'; if(preg_match($preg, $email)){ return true; }else{ echo '<html><head><Script Language="JavaScript">alert("y郵箱格式有誤");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=login.html/">"; }}logout.php
<?php//退出登錄并跳轉到登錄頁面unset($_SESSION['username']);setcookie("username","",time()-1); //清空cookiesetcookie("password","",time()-1);header("location: login.html ");index.php
<?phpsession_start();if(empty($_COOKIE['username'])&&empty($_COOKIE['password'])){ if(isset($_SESSION['username'])) echo "登錄成功，歡迎您".$_SESSION['username']."<a href='logout.php'>退出登錄</a>"; else echo "你還沒有登錄，<a href='login.html'>請登錄</a>";}else echo "登錄成功，歡迎您：".$_COOKIE['username']."<a href='logout.php'>退出登錄</a>";驗證碼和數據庫的實現方法前面寫過，這里不再贅述。
希望本文所述對大家PHP程序設計有所幫助。
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