Convert video blob url into base64 using PHP

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PHP

Base64

I am trying to convert video blob url into base64 using php.

My blob url like this

blob:https://localhost/f4d27a7d-48f1-4499-9613-7953ef01edfe

this I need to convet base64 like

data:video/webm;codecs=vp8;base64,.........

.

This blob url I have converted into base64 by using javascript but I have to do in PHP only

Here is my javascript code what ever I have done

var reader = new FileReader();
 reader.readAsDataURL(recorder.getBlob());
 reader.onloadend = function() {
     var base64data = reader.result;
    console.log(base64data);

In console I got base64 url perfect ,but I have to do in PHP only.

This blob url in php I stored in variable called $blob

$blob =blob:https://localhost/f4d27a7d-48f1-4499-9613-7953ef01edfe

Can any one help me in this one .

Thanks

What I have tried:

var reader = new FileReader();
 reader.readAsDataURL(recorder.getBlob());
 reader.onloadend = function() {
     var base64data = reader.result;
    console.log(base64data);