PHP

using js variable in php

<script type="text/javascript">
var abc= 'this is text';
<?php $abc = "<script>document.write(abc)</script>"?>   
</script>
<?php echo $abc;?>

javascript php variable

<script type="text/javascript">
   var php_var = "<?php echo $php_var; ?>";
</script>

how to use javascript variable in php

<script>
var p1 = "success";
</script>

<?php
echo "<script>document.writeln(p1);</script>";
?>

php var use in javascript

$idget=$_GET['id'];
var id = <?php echo json_encode($idget); ?>;

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

How can I use a JavaScript variable as a PHP variable?

<script type="text/javascript">
var jvalue = 'this is javascript value';

<?php $abc = "<script>document.write(jvalue)</script>"?>   
</script>
<?php echo  'php_'.$abc;?>