PHP代碼總是設置文件上傳標誌設置，即使沒有被上傳

Question

這是我的HTML代碼：

<form id="broadcastForm" onSubmit="return false;" enctype="multipart/form-data"> 
    <div> 
    <label for="image">Select an Image to Broadcast (Optional) <span class="text-danger">[Make sure image size is less than 500Kb]</span></label> 
    <input type="file" accept="image/*" class="btn btn-primary" id="image" name="image[]" class="fileinput" style="margin-top: 10px;" /> 
    <div class="preview_box"> 
     <img id="preview_img" src=""/> 
    </div> 
    </div> 
    <textarea class="textarea form-control" name="message" id="message" placeholder="Enter Message To Broadcast.." style="width: 100%; height: 125px; font-size: 14px; line-height: 18px; border: 1px solid #dddddd; padding: 10px;"></textarea> 
</form> 

這是我的jQuery代碼：

$("button#brodcastMessage").click(function() 
    { 
     var proceed = true, image = $("#image").val(), message = $("#message").val(), type = "", dataSend = ""; 
     var formData = new FormData(); 

     if(image == "" && message == "" || image == null && message == null) 
      { 
       proceed = false; 
       swal({ 
         title: "Error Sending Email!", 
         text: "To send Email Broadcast to your subscribers you need to either select an image or enter the broadcast message. Both the fields are blank!", 
         icon: "error", 
        }); 
      } 

     else if(image == "" || image == null && message != "") 
      { 
       proceed = true; 
       formData.append('message', message); 
       formData.append('image', ""); 
      } 

     else if(message == "" || message == null && image != "") 
      { 
       proceed = true; 
       formData.append('image', $('#image')[0].files[0]); 
      } 

     else if(message != "" && image != "") 
      { 
       proceed = true; 
       formData.append('message', message); 
       formData.append('image', $('#image')[0].files[0]); 
      } 

     if(proceed) 
      { 
       $("button#brodcastMessage").addClass('disabled').attr('disabled', 'true').html("Sending Mail Please Wait..."); 

       $.ajax({ 
          url: '/ajax?id=broadcast', 
          type: 'POST', 
          data: formData, 
          cache: false, 
          contentType: false, 
          processData: false, 
          success:function(response) 
           { 
            resp = response.slice(-3); //read last three characters of a string 

            if(resp == "ack") 
             { 
              $("form#upload_form").trigger('reset'); 
              $("#image").val(""); 
              $('#preview_img').attr('src', ''); 
              $("button#brodcastMessage").removeClass('disabled').html('Send <i class="fa fa-arrow-circle-right"></i>').removeAttr('disabled'); 
              $("form#emailFormSend").trigger('reset'); 
              swal({ 
                title: "Message Sent!", 
                icon: "success", 
               }); 
             } 
            else if(resp == "nak") 
             { 
              $("button#brodcastMessage").removeClass('disabled').html('Send <i class="fa fa-arrow-circle-right"></i>').removeAttr('disabled'); 
              swal({ 
                title: "Error Sending Email!", 
                text: "Please Try Again!", 
                icon: "error", 
               }); 
             } 
            else 
             { 
              $("button#brodcastMessage").removeClass('disabled').html('Send <i class="fa fa-arrow-circle-right"></i>').removeAttr('disabled'); 
              swal({ 
                title: "Error Log!", 
                text: response, 
                icon: "error", 
               }); 
             } 
           }, 
          error:function(response) 
           { 
            $("button#brodcastMessage").removeClass('disabled').html('Send <i class="fa fa-arrow-circle-right"></i>').removeAttr('disabled'); 
            swal({ 
              title: "Network Error!", 
              text: "There was an Error Processing your request! Please try again after some time!", 
              icon: "error", 
             }); 
           } 
         }); 
      } 
    }); 

這是我的PHP代碼：

if($_GET['id'] == "broadcast") 
    { 
     if($_POST['message'] == "" || $_POST['message'] == null && isset($_FILES) && !empty($_FILES)) 
      { 
       //file variable is set 
       $counter = "file"; 
      } 

     if(isset($_FILES) && empty($_FILES) && $_POST['message'] != "" || $_POST['message'] != null) 
      { 
       //message varibale is set 
       $counter = "message"; 
      } 

     if(isset($_FILES) && !empty($_FILES) && $_POST['message'] != "" || $_POST['message'] != null) 
      { 
       //both are present 
       $counter = "both"; 
      } 

     echo $counter; 
     exit(); 
    } 

你好，我正在嘗試做一個ajax文件上傳。現在我創造，我已經提供了2個輸入

廣播消息

1.) Select image & 
2.) Enter message 

現在可以有4個條件

1.) Either both of them are blank (i have handled this on client side) 
2.) Either I only want to broadcast message but not image 
3.) Either I want to broadcast image but not message 
4.) Either I want to broadcast both image and message 

所以我已經將這個在PHP和JQuery端驗證的問題是，當存在是消息集和文件註釋集，然後PHP腳本給出和圖像的錯誤是一個未定義的變量。

什麼我的劇本是做即使文件不被上傳腳本回聲file，如果我沒有uploadeda紐約圖像和純文本郵件設置，那麼它呼應both，因爲過去40小時內，我就在這裏停留的。我不知道我的劇本是錯誤的還是邏輯失敗。任何人都可以用這個邏輯幫助我嗎？

Answer 1

試試這個。

<?php 
    if($_GET['id'] == "broadcast") 
    { 
     $has_message = (isset($_POST['message']) && (strlen(trim($_POST['message'])) >0)); 
     $has_file = (isset($_FILES['image']) && $_FILES['image']['error'] === UPLOAD_ERR_OK); 

     if(!$has_message && $has_file) 
     { 
      //file variable is set 
      $counter = "file"; 
     } 
     else if($has_message && !$has_file) 
     { 
      //message varibale is set 
      $counter = "message"; 
     } 
     else if($has_message && $has_file) 
     { 
      //both are present 
      $counter = "both"; 
     } 
     else { 
      $counter = "neither"; 
     } 

     echo $counter; 
     exit(); 
    } 

Answer 2

isset($_FILES)總是true

empty($_FILES)是true如果沒有上傳的文件，否則false