如何過濾在html上輸入表單的電子郵件？

Question

這是我的HTML和PHP存儲電子郵件。我能做些什麼來確保一個人實際上鍵入一個電子郵件而不是隨機字符。也許代碼看它是否有。「extension」或「@」符號。另外我如何防止重複的電子郵件條目。另外，我希望它在提交時提醒網站訪問者成功，我該如何實現這一點？

任何幫助，將不勝感激！謝謝！

HTML：

<div class="row"> 
    <div class="col-md-12"> 
     <div class="call-to-action text-center"> 
      <form class="form-inline margin-clear"> 
       <div class="form-group has-feedback"> 
        <label class="sr-only" for="subscribe3">Email address</label> 
        <input type="email" class="form-control form-control-lg" id="subscribe3" placeholder="Enter email" name="subscribe3" required=""> 
        <i class="fa fa-envelope form-control-feedback"></i> 
       </div> 
       <button type="submit" class="btn btn-lg btn-gray-transparent btn-animated margin-clear">Subscribe <i class="fa fa-send"></i></button> 
      </form> 
     </div> 
    </div> 
</div> 

PHP：

<?php 
//checking if data has been entered 
if(isset($_POST['subscribe3']) && !empty($_POST['subscribe3'])) 
{ 
    $data = $_POST['subscribe3']; 
} else { 
    header('location: index.html'); 
    exit(); 
} 

//setting up mysql details 
$sql_server = 'localhost'; 
$sql_user = 'root'; 
$sql_pwd = '*PASSWORD*'; 
$sql_db = 'newsletter'; 

// USE A PREPARED STATEMENT LIKE SO FOR SAFETY 
$mysqli = new mysqli($sql_server, $sql_user, $sql_pwd, $sql_db) or die($mysqli->error); 

/* Make sure its an email */ 
if(filter_var($email, FILTER_VALIDATE_EMAIL)){ 
     $query = "INSERT IGNORE INTO email (emails) 
VALUES (?)"; 
$stmt = $conn->prepare($query); 
if($stmt){ 
    $stmt->bind_param("s=",$data); 
    $stmt->execute(); 
    $stmt->close(); 
    $successmessage = "successfully inserted email"; 
} 

    //closing mysqli connection 
    $mysqli->close(); 
    if(isset($_POST['submit'])){ 
    echo $successmessage; 
    } 

?> 

Answer 1

你可以做多件事情：

1. pregmatch ...只是正則表達式快速的例子，使用類似rubular .com來測試它

   if（pregmatch（'/^EXPRESSION $ /'）{0} {

   echo「valid」;

   {

2. 或使用內置的電子郵件過濾器的PHP

http://php.net/manual/en/filter.filters.validate.php

<?php 
    //checking if data has been entered 
    if(isset($_POST['subscribe3']) && !empty($_POST['subscribe3'])) 
    { 
     $data = $_POST['subscribe3']; 
    } else { 
     header('location: index.html'); 
     exit(); 
    } 

    //setting up mysql details 
    $sql_server = 'localhost'; 
    $sql_user = 'root'; 
    $sql_pwd = '*password*'; 
    $sql_db = 'newsletter'; 

    // USE A PREPARED STATEMENT LIKE SO FOR SAFETY 
    $mysqli = new mysqli($sql_server, $sql_user, $sql_pwd, $sql_db) or die($mysqli->error); 

    /* Make sure its an email */ 
    if(filter_var($email, FILTER_VALIDATE_EMAIL)){ 
      $query = "INSERT IGNORE INTO email (emails) 
    VALUES (?)"; 
    $stmt = $conn->prepare($query); 
    if($stmt){ 
     $stmt->bind_param("s=",$data); 
     $stmt->execute(); 
     $stmt->close(); 
     $successmessage = "successfully inserted email"; 
    } 
} 
    //closing mysqli connection 
    $mysqli->close(); 
    if(isset($_POST['submit'])){ 
    echo $successmessage; 
    } 

?> 

至於防止重複，INSERT IGNORE應停止只要你有一個很好的PK組。否則，您可以運行SELECT快速查詢來檢查是否存在任何行，然後對準備好的插入進行if測試，如if（$ numRows == 0）然後插入。我發送的這個也會顯示成功的提交信息