Multiple file upload with ajax and php

Question

I want to uplod multiple files through ajax but I can't figure out how I can grab the files in PHP. Can anyone help me? Thank you! Here is the code:

HTML:

<form  enctype="multipart/form-data" method="POST">
    <input type="file" id="file" multiple="multiple" name="file"/>
</form>
<div id="info"></div>
<div id="preview"></div>

JavaScript:

$(document).ready(function(){
    $("#file").change(function(){

        var src=$("#file").val();
        if(src!="")
        {
            formdata= new FormData();  // initialize formdata
            var numfiles=this.files.length;  // number of files
            var i, file, progress, size;
            for(i=0;i<numfiles;i++)
            {
                file = this.files[i];
                size = this.files[i].size;
                name = this.files[i].name;
                if (!!file.type.match(/image.*/))  // Verify image file or not
                {
                    if((Math.round(size))<=(1024*1024)) //Limited size 1 MB
                    {
                        var reader = new FileReader();  // initialize filereader
                        reader.readAsDataURL(file);  // read image file to display before upload
                        $("#preview").show();
                        $('#preview').html("");
                        reader.onloadend = function(e){
                            var image = $('<img>').attr('src',e.target.result);
                            $(image).appendTo('#preview');
                        };
                        formdata.append("file[]", file);  // adding file to formdata
                        console.log(formdata);
                        if(i==(numfiles-1))
                        {
                            $("#info").html("wait a moment to complete upload");
                            $.ajax({

                                url: _url + "?module=ProductManagement&action=multiplePhotoUpload",
                                type: "POST",
                                data: formdata,
                                processData: false,
                                contentType: false,
                                success: function(res){
                                    if(res!="0")
                                        $("#info").html("Successfully Uploaded");
                                    else
                                        $("#info").html("Error in upload. Retry");
                                }
                            });
                        }
                    }
                    else
                    {
                        $("#info").html(name+"Size limit exceeded");
                        $("#preview").hide();
                        return;
                    }
                }
                else
                {
                    $("#info").html(name+"Not image file");
                    $("#preview").hide();
                    return;
                }
            }
        }
        else
        {
            $("#info").html("Select an image file");
            $("#preview").hide();
            return;
        }
        return false;
    });
});

And in PHP I get $_POST and $_FILES as an empty array; Only if I do file_get_contents("php://input"); I get something like

-----------------------------89254151319921744961145854436
Content-Disposition: form-data; name="file[]"; filename="dasha.png"
Content-Type: image/png

PNG

���
IHDR��Ò��¾���gÇº¨���    pHYs��������tIMEÞ/§ýZ�� �IDATxÚìw`EÆgv¯¥B-4 ½Ò»tBU©)"¶+*"( E¥J7ôÞ;Ò¤W©¡&puwçûce³WR¸ èóûrw»³ï}fö

But I can't figure out how to proceed from here.

I am using Jquery 1.3.2 maybe this is the problem?

Thank you!

try to use name as a array. like file[]

Ritesh d joshi
– Ritesh d joshi

2014-09-11 10:56:21 +00:00
Commented Sep 11, 2014 at 10:56 — Ritesh d joshi
– Ritesh d joshi, Commented Sep 11, 2014 at 10:56

Community · Accepted Answer · 2017-05-23 10:29:36Z

1

Sorry about the answer, but I can't add a comment yet.

I would recommend not checking the file type in javascript, it is easily bypassed. I prefer to scrutinise the file in PHP before allowing it to be uploaded to a server.

e.g.

This answer taken from another question (uploaded file type check by PHP), gives you an idea:

https://stackoverflow.com/a/6755263/1720515

<?php
$allowedTypes = array(IMAGETYPE_PNG, IMAGETYPE_JPEG, IMAGETYPE_GIF);
$detectedType = exif_imagetype($_FILES['fupload']['tmp_name']);
$error = !in_array($detectedType, $allowedTypes);
?>

You can read the documentation on the exif_imagetype() function here.

Could you post your PHP code please? And I will update my answer if I have anything to add.

UPDATE:

NOTE: The 'multiple' attribute (multiple="multiple") cannot be used with an <input type='file' /> field. Multiple <input type='file' /> fields will have to be used in the form, naming each field the same with [] added to the end to make sure that the contents of each field are added to an array, and do not overwrite each other when the form is posted.

e.g.

<form  enctype="multipart/form-data" method="POST">
  <input type="file" id="file_0" name="img_file[]" />
  <input type="file" id="file_1" name="img_file[]" />
  <input type="file" id="file_2" name="img_file[]" />
</form>

When the form is submitted, the contents of any <input type='file' /> fields will be added to the PHP $_FILES array. The files can then be referenced using $_FILES['img_file'][*parameter*][*i*], where 'i' is key associated with the file input and 'paramter' is one of a number of parameters associated with each element of the $_FILES array:

e.g.

$_FILES['img_file']['tmp_name'][0] - when the form is submitted a temporary file is created on the server, this element contains the 'tmp_name' that is generated for the file.
$_FILES['img_file']['name'][0] - contains the file name including the file extension.
$_FILES['img_file']['size'][0] - contains the file size.

$_FILES['img_file']['tmp_name'][0] can be used to preview the files before it is permanently uploaded to the server (looking at your code, this is a feature you want to include)

The file must then be moved to its permanent location on the server using PHP's move_uploaded_file() function.

Here is some example code:

<?php
  if (!empty($_FILES)) {
    foreach ($_FILES['img_file']['tmp_name'] as $file_key => $file_val) {
      /*
        ...perform checks on file here

        e.g. Check file size is within your desired limits,
             Check file type is an image before proceeding, etc.
      */

      $permanent_filename = $_FILES['img_file']['name'][$file_key];

      if (@move_uploaded_file($file_val, 'upload_dir/' . $permanent_filename)) {
        // Successful upload
      } else {
        // Catch any errors 
      }
    }
  }
?>

Here are some links that may help with your understanding:

Plus, some extra reading concerning the theory around securing file upload vulnerabilities:

http://en.wikibooks.org/wiki/Web_Application_Security_Guide/File_upload_vulnerabilities

edited May 23, 2017 at 10:29

CommunityBot

11 silver badge

answered Sep 11, 2014 at 11:09

James Whiteley

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4 Comments

Marian Over a year ago

About the PHP code I cant post any thing because I can't figure out how to grab the data and to process it only thing I have a input $file = file_get_contents("php://input"); print_r($file);

Marian Over a year ago

I am aware how to upload a file on the server but the main problem that i encounter is that I am trying to do that with ajax. At the moment a simple var_dump of the globals $_FILES and $_POST returns emppty. the only way I get something in return is by using $file = file_get_contents("php://input"); but i dont know how to proceed from this. Thank you James for the answers!

James Whiteley Over a year ago

So the PHP file that you are posting to (_url + "?module=ProductManagement&action=multiplePhotoUpload") only contains $file = file_get_contents("php://input"); print_r($file);?

Marian Over a year ago

yes, and a simple var_dump shows in the console a string o characters like I showed above.

Raja · Accepted Answer · 2014-09-11 10:40:35Z

You can use ajax form upload plugin

That's what i have found couple of days ago and implemented it this way
Ref : LINK

You PHP Code can be like this

uploadimage.php

    $response = array();
    foreach ($_FILES as $file) {
        /* Function for moving file to a location and get it's URL */
        $response[] = FileUploader::uploadImage($file);
    }
    echo json_encode($response);

JS Code

      options = {
                beforeSend: function()
                {
                    // Do some image loading
                },
                uploadProgress: function(event, position, total, percentComplete)
                {
                    // Do some upload progresss
                },
                success: function()
                {
                    // After Success
                },
                complete: function(response)
                {
                    // Stop Loading
                },
                error: function()
                {

                }

            };

            $("#form").ajaxForm(options);

Now you can call any AJAX and submit your form.

Kanaiyalal Badal · Accepted Answer · 2020-03-19 12:36:22Z

You should consider below code

HTML

   <input type="file" name="fileUpload" multiple>

AJAX

first of all you have to get all the files which you choose in "input type file" like this.

        var file_data = $('input[type="file"]')[0].files;
        var form_data = new FormData();

        for(var i=0;i<file_data.length;i++)
        {

            form_data.append(file_data[i]['name'], file_data[i]);
        }

then all your data is in formData object now you can send it to server(php) like this.

        $.ajax({
            url: 'upload.php', //your php action page name
            dataType: 'json', 
            contentType: false,
            processData: false,
            data: form_data,
            type: 'post',
            success: function (result) {
              // code you want to execute on success of ajax request
            },
            error: function (result) {
              //code you want to execute on failure of ajax request
            }
        });

PHP

<?php

foreach($_FILES as $key=>$value)
{
 move_uploaded_file($_FILES[$key]['tmp_name'], 'uploads/' .$_FILES[$key]['name']);

}

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