Here is the way to pass the value of a PHP variable into a JavaScript variable.
<?php
$php_var = "PHP";
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Test</title>
</head>
<body>
<h1>Hello World !</h1>
<script>
const js_var = "<?php echo $php_var; ?>";
console.log(js_var);
</script>
</body>
</html>
Access the PHP variable from an external JS file
<?php
$php_var = "PHP";
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Test</title>
</head>
<body>
<h1>Hello World !</h1>
<script>
const js_var = "<?php echo $php_var; ?>";
</script>
<script src="./test.js"></script>
</body>
</html>console.log(`From test.js => ${js_var}`)
