本文實例講述了PHP實現的用戶注冊表單驗證功能。分享給大家供大家參考，具體如下：
注冊界面
register.html
<h1>用戶注冊</h1> <form method="post" action="register_verify.php"> <input type="text" placeholder="用戶名" name="username"><br><br> <input type="password" placeholder="密碼" name="password"><br><br> <input type="password" placeholder="重復密碼" name="password2"><br><br> <label>性別： <input type="radio" name="sex" value="男" checked="checked">男 <input type="radio" name="sex" value="女">女</label><br><br> <input type="email" placeholder="郵箱" name="email"><br><br> <button class="btn" type="submit">注冊</button> </form>
register_verify.php
<?phprequire "mysql.php"; //導入mysql.php訪問數據庫$username=$_POST['username'];$password=$_POST['password'];$password2=$_POST['password2'];$sex=$_POST['sex'];$email=$_POST['email'];if(checkEmpty($username,$password,$password2,$sex,$email)){ if(checkpwd($password,$password2)){ if(checkEmail($email)){ if(insert($username,$password,$sex,$email)) echo"注冊成功"; } }}//方法：判斷是否為空function checkEmpty($username,$password,$password2,$sex,$email){ if($username==null||$password==null||$password2==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=register.html/">"; } else{ if($sex==null){ echo '<html><head><Script Language="JavaScript">alert("性別為空");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=register.html/">"; } elseif($email==null){ echo '<html><head><Script Language="JavaScript">alert("郵箱為空");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=register.html/">"; } else{ return true; } }}//方法：檢查兩次密碼是否相同function checkpwd($password,$password2){ if($password==$password2) return true; else echo '<html><head><Script Language="JavaScript">alert("兩次密碼不一致");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=register.html/">";}//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, $email)){ return true; }else{ echo '<html><head><Script Language="JavaScript">alert("郵箱格式有誤");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=register.html/">"; }}//方法：將數據插入數據庫中function insert($username,$password,$sex,$email){ $conn=new Mysql(); $sql="insert into user VALUE (null,'$username','$password','$sex','$email')"; $result=$conn->sql($sql); if($result){ return true; } else{ echo '<html><head><Script Language="JavaScript">alert("寫入數據庫失敗");</Script></head></html>' . "<meta http-equiv=/"refresh/" content=/"0;url=register.html/">"; } $conn->close();}驗證碼和數據庫的實現方法前面寫過，這里不再贅述。
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