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How to mix JavaScript and PHP



Just as you can easily mix HTML and PHP you can also mix JavaScript and PHP. But why would you mix PHP and JavaScript?

As you probably know that both PHP and JavaScript are used to develop web-based applications (mostly) but the big difference is that PHP is a server side scripting language and JavaScript is a client side scripting language. This means the code of PHP runs on the server and that of JavaScript runs inside your browser, locally.

Since both the programming platforms have their respective strengths sometimes we need to combine them in order to create optimal applications. Whereas PHP is great for handling databases, intricate programming logic, and lots of other stuff that happens on the server, JavaScript is great for creating compelling user experience and interface.

Given below is the easiest example you can refer to in order to understand how to mix JavaScript and PHP:

<?php
$n = 3;
if($n == 1)
{
?>
        <script language=”javascript”>
alert(“One”);
</script>
<?php
}
else
{
?>
        <script language=”javascript”>
alert(“Some other number”);
</script>
<?php
}
?>

Don’t worry about the simplicity of the example, just focus on the logic. This also explains why sometimes we need to use JavaScript even if we are creating entire application in PHP. With PHP you cannot display an alert box the way you can do it in JavaScript.

The if-else condition could have been anything, and it doesn’t have to be conditional whenever we have to mix JavaScript and PHP. And you could have also outputed the JavaScript portion using the echo or print command of PHP.

As you can see above the primary decision maker is PHP. If the if-else decision was based on some JavaScript logic resulting in the execution of some PHP code perhaps it wouldn’t have worked. I’m not sure. Will test it out and update this post. You are welcome to add your own opinion in the comments section.

4 thoughts on “How to mix JavaScript and PHP

  1. Pingback: How to mix JavaScript and PHP | Neorack Tutorials

  2. HappyDad

    Because PHP can’t do dialog boxes to alert a user… the example he provided does show by both PHP and JS are needed.

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