php - How to POST blob as a file using javascript? -

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i have form, contents 2 inputs 1 hidden name="action" , second name="avatar" type="file". after user choose file in avatar input image converts blob. how can post blob loaded file , after submited?

form:

<form enctype="multipart/form-data" method="post" id="avatarform">     <input type="hidden" name="action" value="save" />     <input id="coolbutton" name="avatar" type="file" accept="image/*" class="form-control" placeholder=""> </form>

i have try:

var fd = new formdata(); fd.append('action', 'save'); fd.append('avatar', file.name); fd.append('data', blob);  $.ajax({     type: 'post',     url: '/',     data: fd,     processdata: false,     contenttype: false }).done(function(data) {        console.log(data); });

php controller:

    if ($_files['avatar']['name']) {         if ($profile->avatar==1) {             unlink('/images/avatars/'.$profile->avatar);             $profile->avatar=0;         }         $filename="avatar_".$user_id.'.'.pathinfo($_files['avatar']['name'], pathinfo_extension);         move_uploaded_file($_files['avatar']['tmp_name'],$_server['document_root'] ."/images/avatars/".$filename);         $profile->avatar=$filename;     }

but php controller not save it. if use form without script wich converts image blob - works , save file.

i have updated script

fd.append('blob', blob.replace("data:image/png;base64,", "") fd.append('ext', "jpg") // send ext of uploaded file

and php controller

    if ($_post['blob']) {         if ($profile->avatar==1) {             unlink('/images/avatars/'.$profile->avatar);             $profile->avatar=0;         }         $file = base64_decode($_post['blob']);         $filename="avatar_".$user_id.'.'.$_post['ext'];         file_put_contents($_server['document_root'] ."/images/avatars/".$filename, $file);         $profile->avatar=$filename;     }

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