sending php variable to 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: php variable as javascript function parameter in echo

<?php echo "<script> autoFill(".$dropDown.", ".$emptyDropDown."); </script>"; ?>