PHP Quivalent of this JS Code

<script>
            function parse(){
                document.getElementById("text").innerText = 'processing audio';
                let file =  document.getElementById("clip").files[0];
                let reader = new FileReader();
               
                reader.onload = (evt) => {
                    let contents = evt.target.result;

                    let request = new XMLHttpRequest();
                    request.open("POST", "http://example.com/treat");

                    request.setRequestHeader('Content-Type', file.type === 'video/webm' ? 'audio/webm': file.type);
                    
                    request.onload = (event) => {
                        if(event.currentTarget.status == 200 && event.currentTarget.readyState == 4){
                            document.getElementById("text").innerText = `The Parsed Audio is: ${JSON.parse(request.response).text}`
                        }else{
                            document.getElementById("text").innerText = "Processing failed"
                        }
                    }

                    request.send(contents);
                }

                reader.readAsArrayBuffer(file);
            }
        </script>

Please how can I create a replica of this in PHP..... This code accepts and audio file and streams it to the supplied URL. The Url now send a transcription of that Audio file.

Thank You