Answers for "pass php variable to javascript variable"

js var to php

<script>
   var res = "success";
</script>
<?php
   echo "<script>document.writeln(res);</script>";
?>

php pass a variabele to js

<script>
'var name = <?php echo json_encode($name); ?>;
</script>'

use php var in js

// (A) CONVERT ARRAY TO STRING
$data = ["Apple", "Banana", "Cherry"];
$encoded = json_encode($data);
?>
 
<!-- (B) THIS IS JAVASCRIPT -->
<script>
// (B1) JSON ENCODED STRING
var encoded = '<?=$encoded?>';
console.log(encoded); // STRING
 
// (B2) JSON PARSE (DECODE)
var data = JSON.parse(encoded);
console.log(data); // ARRAY