PHP Script由于Isset（）而死亡。其他选项？

问题描述：

我有一个接触的形式，我试图运行，但是由于各种原因，该脚本将每次我试图提交它死的。不知道为什么。下面的代码有什么毛病吗？我之前没有使用isset（），但这里有人建议我这样做，现在它打破了页面。PHP Script由于Isset（）而死亡。其他选项？

FORM

  <form class="contactform" method="post" action="php/contact.php"> 
       <h3>Name</h3> 
       <input class="form inputboxes" type="text" name="name"> 
       <h3>Email</h3> 
       <input class="form inputboxes" type="email" name="email"> 
       <h3>Phone</h3> 
       <input class="form inputboxes" type="number" name="phone"> 
       <h3>Message</h3> 
       <textarea class="form inputboxes" name="message"></textarea> 
       <h3 class="captchastyle">Are you real? What is 2 + 2?</h3><input class="captcha captchastyle" type="text" name="captcha" maxlength="1"> 
       <input class="form submit" name="submit" type="submit" value="Submit"> 
      </form>

PHP

<?php 
    $name = $_POST['name']; 
    $email = $_POST['email']; 
    $phone = $_POST['phone']; 
    $message = $_POST['message']; 
    $captcha = $_POST['captcha']; 
    $from = 'From: HankSmith.com Contact Form'; 
    $to = '[email protected]'; 
    $subject = 'HANK SMITH CONTACT FORM'; 

    $body = " 
      From: $name\n 
      E-Mail: $email\n 
      Phone: $phone\n 
      Message: $message\n"; 

if (isset($_POST['submit'] && $captcha == 4)) {     
     if (mail ($to, $subject, $body)) { 
     echo '<p style="margin-top: 150; text-align:center; font-size: 18px;">Your message has been sent! Click <a href="../index.php">here</a> to return to the website.</p>'; 
     } else { 
      echo '<p>Problem sending mail!'; 
     } 
    } else { 
     echo '<p>Something went wrong, try again later!</p>'; 
    } 
?>

的error_log

[09-Feb-2017 12:15:46 America/New_York] PHP Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /home/yourerlv/public_html/hanksmith.com/php/contact.php on line 17

你的括号（）'测试是错误的。它应该是'if（isset（$ _ POST ['submit']）&& $ captcha == 4）' – WillardSolutions

答

你就错了。您需要通过，所以它只能评估一个变量移动括号：

if (isset($_POST['submit']) && $captcha == 4) { 
         ^

答

更改代码：各地`isset

if (isset($_POST['submit'] && $captcha == 4)) { // Original 
if (isset($_POST['submit']) && $captcha == 4) { // Changed

PHP Script由于Isset（）而死亡。其他选项？

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