If you want to pass data from one PHP file to another, you can use AJAX (Asynchronous JavaScript and XML). Also, jQuery is a very useful library for harnessing your JavaScript’s potential.
In this example we will pass one variable from ‘storage.php’ and show it to ‘index.php’.
index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AJAX using Jquery</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script>
$.ajax(
'storage.php', {
success: function(data) {
alert('AJAX call success! \nThe data passed is: ' + data);
},
error: function() {
alert('An error occurred!');
}
}
);
</script>
</body>
</html>
storage.php
<?php
$variable = "Congrats!";
echo $variable;
Save the two files on your localhost directory. If you don’t know how to setup your localhost server, you can check my simple tutorial on Coding Basics: How to host your own website using localhost (LAN).
Enjoy!
Curbside Coder 
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