javascript - PHP 代码总是设置文件上传标志，即使没有上传任何内容

Question

这是我的 HTML 代码:

<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>

这是我的 JQuery 代码:

$("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",
                                        });
                                }
                        });
            }
    });

这是我的 PHP 代码:

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();
    }

您好，我正在尝试进行ajax文件上传。现在我正在创建一条广播消息，其中我提供了 2 个输入

1.) Select image &
2.) Enter message 

现在可以有 4 个条件

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

所以我在 PHP 和 JQuery 端验证上设置了这个，问题是当有消息集和文件注释集时，php 脚本会给出图像的错误是一个 undefined variable 。

我的脚本正在做的是，即使文件没有上传，脚本也会回显文件，如果我没有上传任何图像并且只设置了文本消息，那么它会回显两者，过去 4 个小时以来我一直被困在这里。我不知道我的脚本是错误的还是逻辑失败的。谁能帮我解释一下这个逻辑？

Answer 1

试试这个。

<?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();
    }