how to get php variable in 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 javascript variable in php

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

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

Example 4: how to use php echo data in javascript

<?php
$php_variable = 'string'; //Define our PHP variable. You can of course get the value of this variable however you need.
?>			
        <script> js_variable_name = "<?php echo $php_variable; ?>";</script>