How do I play two audio files one after the other in PHP

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audio

I want too play two audio files using php
First file should play first and when it stops the second one should start playing .I have the following code but the PROBLEM is both are getting played simultaneously and its really getting mixed up plz help

What I have tried:

?php

$y=2;
$z=3;
$filea="bflat.mp3";
$fileb="SUUCgrcp.mp3";   
if($y==2){
    
     echo "<embed src =\"$filea\" hidden=\"true\" autostart=\"false\"></embed>";
    
    
} 

if($z==3){
    
  echo "<embed src =\"$fileb\" hidden=\"true\" autostart=\"false\"></embed>";
}