How to embed PHP code in JavaScript

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How can we use PHP code in JavaScript?

Like

function jst()
{
    var i = 0;
    i = <?php echo 35; ?>
    alert(i);
}

Please suggest a better way.

Nov 9, 2020 in PHP by kartik
• 37,510 points
525 views

1 answer to this question.

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Hello,

If your whole JavaScript code gets processed by PHP, then you can do it just like that.

If you have individual .js files, and you don't want PHP to process them (for example, for caching reasons), then you can just pass variables around in JavaScript.

For example, in your index.php (or wherever you specify your layout), you'd do something like this:

<script type="text/javascript">
    var my_var = <?php echo json_encode($my_var); ?>;
</script>

You could then use my_var in your JavaScript files.

This method also lets you pass other than just simple integer values, as json_encode() also deals with arrays, strings, etc. correctly, serialising them into a format that JavaScript can use.

answered Nov 9, 2020 by anonymous
• 82,680 points

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