Question

how can use JS variable in PHP like this ?

<script>
x = document.getElementById(1).value;
var listOf = <?php echo $listOf[x]; ?>;
</script>

this doesn’t work 🙁

Answer 1

And rightfully so. PHP is executed on the server, while JavaScript is executed in the client’s browser. Those are two different contexts and the variables from one are not visible in the second.

You need to have your PHP script output a JavaScript version of the array and then use this one in your script. Something like this:

<?php
echo "listArray = new Array();\n";
foreach ($listArray as $key => $value) {
   echo 'listArray[', $key, '] = ', $value, ";\n";
}