如何設置，如果低於

Question

isset語句下面我有在當一個文件上傳完畢，它會顯示neccessary消息的JavaScript函數：

function stopImageUpload(success){ 

     var imagename = <?php echo json_encode($imagename); ?>; 
     var result = ''; 
     if (success == 1){ 
     result = '<span class="msg">The file was uploaded successfully!</span><br/><br/>'; 
     $('.listImage').append(imagename + '<br/>'); 
     } 
     else { 
     result = '<span class="emsg">There was an error during file upload!</span><br/><br/>'; 
     } 

return true; 
} 

現在我想找回低於$ _SESSION變量，然後使用上面的javascript函數（在單獨的頁面上）將$ _SESSION作爲'$ imagename'調用，然後將其附加到.list中。

但是我的問題是如何編寫上面的if issett語句，以便它可以判斷下面的$ _SESSION變量是否已設置，然後我可以使用$ imagename檢索會話？

下面是PHP腳本，它包含$ _SESSION並在文件上傳：

if (isset($_POST['fileImage'])) { 
     $_SESSION['imagename'] = $_FILES['fileImage']['name']; 

    if(file_exists("ImageFiles/".$_FILES['fileImage']['name'])) { 
     $_SESSION['fileImage']['name'] = $_FILES['fileImage']['name']; 
     $parts = explode(".",$_FILES['fileImage']['name']); 
     $ext = array_pop($parts); 
     $base = implode(".",$parts); 
     $n = 2; 

     while(file_exists("ImageFiles/".$base."_".$n.".".$ext)) $n++; 
     $_FILES['fileImage']['name'] = $base."_".$n.".".$ext; 

     move_uploaded_file($_FILES["fileImage"]["tmp_name"], 
     "ImageFiles/" . $_FILES["fileImage"]["name"]); 
     $result = 1; 


    } 
     else 
      { 
      move_uploaded_file($_FILES["fileImage"]["tmp_name"], 
      "ImageFiles/" . $_FILES["fileImage"]["name"]); 
      $result = 1; 

      } 
     } 


    ?> 

    <script language="javascript" type="text/javascript"> 
window.top.stopImageUpload(<?php echo "'$result'";?>);</script> 

Answer 1

嘗試

var imagename = <?php if (isset($_SESSION['imagename'])) echo json_encode($_SESSION['imagename']); ?>;