PHP / HTML行导致页面空白[关闭]

Question

I really have no idea how to fix this. Everytime I add this line of code to my php document, the page goes blank. Has anyone encountered this issue before?

It's in a table. Apparently it's the checked_id[] array. Don't know how to fix it, it just causes the page to go blank when added.

<td align="center"><input type="checkbox" name='.checked_id[];.' class="checkbox" value='.$row["id"].'</td>

Here's the whole block.

 $output .= '  
<form name="bulk_action_form" action="delete_multiple.php" method="post" onSubmit="return delete_confirm();"/>
      <div class="table-responsive">  
           <table class="table table-bordered">  
                <tr>  

                     <th width="10%">Id</th>  
                     <th width="40%">Name</th>  
                     <th width="40%">Email</th>  
                     <th width="40%">Address</th>  
                     <th width="10%">phoneNumber</th>  
                     <th width="10%">appointmentTime</th> 
                     <th width="10%">appointmentDate</th> 
                     <th width="50%">message</th> 
                     <th width="10%">delete</th>
                     <th><input type="checkbox" name="select_all" id="select_all" value=""/></th>
                </tr>';  



                             if(mysqli_num_rows($result) > 0)  
                             {  
                                  while($row = mysqli_fetch_array($result))  
                                  {  
                                       $output .= '  




                <tr>  

                     <td>'.$row["id"].'</td>
                     <td class="name" data-id1="'.$row["id"].'" contenteditable>'.$row["name"].'</td>  
                     <td class="email" data-id2="'.$row["id"].'" contenteditable>'.$row["email"].'</td>
                     <td class="address" data-id2="'.$row["id"].'" contenteditable>'.$row["address"].'</td>  
                     <td class="phoneNumber" data-id2="'.$row["id"].'" contenteditable>'.$row["phoneNumber"].'</td>  
                     <td class="appointmentTime" data-id2="'.$row["id"].'" contenteditable>'.$row["appointmentTime"].'</td>  
                     <td class="appointmentDate" data-id2="'.$row["id"].'" contenteditable>'.$row["appointmentDate"].'</td>
                     <td class="message" data-id2="'.$row["id"].'" contenteditable>'.$row["message"].'</td>
                     <td><button type="button" name="delete_btn" data-id3="'.$row["id"].'" class="btn btn-xs btn-danger                             btn_delete">Delete</button></td>
                     <td><input type="checkbox" name="'.checked_id[].'" class="checkbox" value="'.$row["id"].'"/></td>
                </tr>  
           ';  
      }                                   

 }  
 else  
 {  

      $output .= '<tr><td colspan="4">Data not Found</td></tr>';  
 }  


 $output .= '</table>  
      </div></form>';  
 echo $output;  
 ?>  

Answer 1

Not properly structured:

1. Missing close tag
2. Missing quotes

Use like this:

<input type="checkbox" name="'.checked_id[].'" class="checkbox" value="'.$row["id"].'"/></td>
                            ^            ^ ^ ^                        ^              ^^^