create php variable from javascript code example

Example 1: javascript php variable

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

Example 2: javascript access php variable

//passing PHP variable to JavaScript
var myJSVar = <?php echo json_encode($myPHPVar); ?>;

Example 3: how to use php variable in javascript file

<?php
$bool = false;
$num = 3 + 4;
$str = "A string here";
?>