PHP如果其他語句不能正常工作

Question

我做了一個php評論系統，但它似乎代碼都沒事&我也沒有得到任何錯誤消息。

這裏是我的代碼：

<?php 
$con = mysqli_connect("localhost","root","","ecommerce"); 
$errors = array(); 
if (isset($_POST['submit'])){ 
    $name = (isset($_POST['name'])); 
    $email = (isset($_POST['email'])); 
    $comment = (isset($_POST['comment'])); 

    if (empty($name)){ 
     $err['name1'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:30px;float:right;'>Please write down your name!</p>"; 
    }else{ 
     $name_length = strlen($name); 
     if ($name_length > 2){ 
      if (!empty($email)){ 
        $email_verification = test_input($email); 
        if (!filter_var($email_verification, FILTER_VALIDATE_EMAIL)) { 
        $err['email1'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:25px;float:right;'>Your email is not written correctly!</p>"; 
       }else{ 
        if (empty($comment)){ 
         $err['comment1'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:25px;float:right;'>Please write your comment!</p>"; 
        }else{ 
         $comment_length = strlen($comment); 
         if (($comment_length < 5) || ($comment_length > 100)){ 
          $err['comment2'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:25px;float:right;'>Your comment must be between 5 to 100 characters!</p>"; 
         }else{ 
          $que = $con->query("SELECT * FROM product_comments WHERE productcode='%s'", $_SESSION['pro_id']); 
          if(mysqli_num_rows($que) == 0){ 
          $insert_id2 = "insert into product_comments (productcode) values ('$product_id')"; 
          $insert_id2 = mysqli_query($con, $insert_id2); 
          } 
         } 
        } 
       } 
      }else{ 
       $err['email2'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:25px;float:right;'>Please write your email down!</p>"; 
      } 
     }else{ 
      $err['name2'] = "<p style='color:red;font-family: BCompset, Arial, Helvetica, sans-serif;font-size:30px;float:right;'>Your name must be more than 2 words!</p>"; 
     } 
    } 

    //check errors 
     if(count($err) == 0) 
     { 

      $insert_comment = "insert into product_comments (email,name,comment,modified_date, modified_time) values ('$email_verification','$name','$comment',CURDATE(), CURTIME())"; 
      $insert_comment = mysqli_query($con, $insert_comment); 
      $succ = "<script>alert('Your comment is submitted correctly')</script>"; 
     } 
} 

function test_input($data) { 
    $data = trim($data); 
    $data = stripslashes($data); 
    $data = htmlspecialchars($data); 
    return $data; 
} 
?> 
<form action='' method='POST'> 
    <span> 
     <input type='text' name='name' placeholder='Your Name'/> 
     <input type='email' name='email' placeholder='Email Address'/> 
    </span> 
     <textarea name='' name='comment' placeholder='Comment'></textarea> 

     <input name='submit' style='font-family: BJadidBold, Arial, Helvetica, sans-serif;' type='submit' value='Submit' class='btn btn-default pull-right'></input> 
</form> 
<p><?php if(isset($err['name1'])) echo $err['name1']; ?></p> 
<p><?php if(isset($err['name2'])) echo $err['name2']; ?></p> 
<p><?php if(isset($err['email1'])) echo $err['email1']; ?></p> 
<p><?php if(isset($err['email2'])) echo $err['email2']; ?></p> 
<p><?php if(isset($err['comment1'])) echo $err['comment1']; ?></p> 
<p><?php if(isset($err['comment2'])) echo $err['comment2']; ?></p> 

每次我要提交與正確信息的形式我剛剛得到這個$ ERR [「名2」]錯誤是

您的名字留言必須超過2個字

我不知道爲什麼發生這種情況，所以如果你知道它有什麼問題，請讓我知道......謝謝！

Answer 1

這不是做你認爲：

$name = (isset($_POST['name'])); 

isset()返回一個布爾值。它不會返回它正在檢查的東西的價值。這意味着，$name不會包含您所期望的，這是造成這種評估對false：

if ($name_length > 2){ 

（我猜是$name結束含有0或1時解釋爲串，從而strlen($name)解析爲1）

試圖設置的值時，需要取下isset()：

$name = $_POST['name'];