AJAX/PHP - Upload a large file in segments in pure javascript

Question

I'm trying to let users upload huge files ~1GB using PHP and HTML/JS. I know from past experiences that uploading files ~10mb also causes PHP to refuse the request.

Issue is, the request in my js gets sent, but I can't figure out how to send blobs through php. the post request is always empty

My javascript goes like this:

    var xhttp = new XMLHttpRequest();
function doThing(){
      var file = document.getElementById("file_upload").files[0];
      var chunkSize = 1024 * 1024;
      var fileSize = file.size;
      var chunks = Math.ceil(file.size/chunkSize,chunkSize);
      var chunk = 0;

      console.log('file size..',fileSize);
      console.log('chunks...',chunks);
      sendFileSlice(file, chunkSize, chunk, chunks); 
}

function sendFileSlice(file, chunkSize, chunk, chunks)
{
      if(chunk <= chunks)
      {
          var offset = chunk*chunkSize;
          xhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
             chunk++;
             sendFileSlice(file, chunkSize, chunk, chunks);
            }
          };
          xhttp.open("POST", "printchunks.php", true);
          xhttp.send(file.slice(offset,offset+chunkSize));
      }
}

and my php, just for test, goes like this:

<?php
//temporarily just put contents into a random file
file_put_contents(time()+rand(), print_r($_POST, true));
?>

I'm using Splitting a File into Chunks with Javascript this as an example for splitting, but i can't find AJAX using pure Javascript. I do NOT want JQuery, that's the last thing I need, I just want to send a blob to PHP so it can append it to the file. This seems to work in terms of splitting, it just doesn't have anything in the files produced

score 2 · Accepted Answer · answered Apr 06 '19 at 21:24

I forgot that I had to use

xhttp.setRequestHeader('Content-Type', 'application/octet-stream');

before sending to set the stream to be a blob. With this, I can now save the file using this PHP:

<?php
file_put_contents(time()+rand(), file_get_contents("php://input"));
?>

Of course this saves it into some random file, so if this helps anyone, please change the code to fit your needs

AJAX/PHP - Upload a large file in segments in pure javascript

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