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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

PHP實現的用戶注冊表單驗證功能簡單示例

  <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

<?php
require "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。

希望本文所述對大家PHP程序設計有所幫助。