Automatically optimize your CSS and JavaScript files with PHP

If, like many people, you like to spread your JavaScript and CSS over a handful of files you may be introducing an unnecessary overhead to your server. If you have a simple page, but 6 CSS files and 6 JavaScript files, users will have to make 13 separate requests to your webserver to load the page. By collating these files you can reduce this to 3 page requests, removing the stress of multiple requests on both the client and server.

Furthermore, assuming you have output compression enabled, the resulting collated file will almost certainly be smaller than the sum of the individual files, due to the way compression algorithms work.

Here's how to achieve this in PHP:

We'll give a description for JavaScript files, as the solution for CSS is identical but for the output tag you need to produce.

First, you'll want to request a collection of JS files to be written:

$script_tag = fetch_script_cache(array('global.js', 'widget.js', 'search.js', 'map.js'));

Now we define our function

function fetch_script_cache($files) {
	// Generate cache index
	$key = md5(join("|", $files));
	// Calculate the latest modification to our files
	$max_time = 0;
	foreach($files as $file)
		$max_time = max(filemtime($file), $max_time);
	// Prepend the name of the directory where we store the cache files
	$path = "outputcache/$key";
	// Determine if the cache needs updating, then do it
	if(!file_exists($path ) or filemtime($path ) < $max_time) {
		$cache = "";
		foreach($files as $file)
			$cache .= file_get_contents($file)."\r\n";
		file_put_contents($path , $cache);
	return "<script type=\"text/javascript\" src="$path"></script>";

The first thing we do is generate an cache index ($key) based on all of the filenames. The we go through all of our files to find out which was the most recently modified, and check if that is more recent than the age of the cache. If it is, the we need to update the cache. The cache file is simply a concatenation of all the files in the list (and we add a line break "\r\n" to avoid any complications).

Our return value is simply a well-formed script tag pointing at the output cache file. The should be outputted in the head of the document, and you're all done!

All scripts are Public Domain.


nice way to optimize stupid code. Thanks

Nice post. thank you for sharing

Very Informative
Thanks for Sharing

Thank you so much for your information,its very useful and helful to me.Keep updating and sharing. Thank you.
RPA training in chennai | UiPath training in chennai

Great efforts put it to find the list of articles which is very useful to know, Definitely will share the same to other forums.
machine learning training in Chennai

machine learning training center in chennai

top institutes for machine learning in chennai

Such a Great Article!! I learned something new from your blog. Amazing stuff. I would like to follow your blog frequently. Keep Rocking!!
Blue Prism training in chennai | Best Blue Prism Training Institute in Chennai

Thanks for such a great article here. I was searching for something like this for quite a long time and at last, I’ve found it on your blog. It was definitely interesting for me to read about their market situation nowadays.AngularJS Training in Chennai | Best AngularJS Training Institute in Chennai

Given so much info in it, The list of your blogs are very helpful for those who want to learn more interesting facts. Keeps the users interest in the website, and keep on sharing more
Our Credo Systemz Which is designed to offer you OpenStack Training skills required to kick-start your journey as an OpenStack Cloud Administrator.
Please free to call us @ +91 9884412301 / 9600112302
Openstack course training in Chennai | best Openstack course in Chennai | best Openstack certification training in Chennai | Openstack certification course in Chennai | openstack training in chennai omr | openstack training in chennai velachery | openstack training in Chennai | openstack course fees in Chennai | openstack certification training in Chennai | best openstack training in Chennai | openstack certification in Chennai

Thanks for posting useful information.You have provided an nice article, Thank you very much for this one. And i hope this will be useful for many people.. and i am waiting for your next post keep on updating these kinds of knowledgeable things...Really it was an awesome article...very interesting to read..please sharing like this information......
PHP interview questions and answers | PHP interview questions for freshers

Great post! I am actually getting ready to across this information, It's very helpful for this blog. Also great with all of the valuable information you have Keep up the good work you are doing well.DevOps Training in Chennai | Best DevOps Training Institute in Chennai

Nice blog..! I really loved reading through this article. Thanks for sharing such a
amazing post with us and keep blogging... Best React js training near me | React js training online

Inspiring writings and I greatly admired what you have to say , I hope you continue to provide new ideas for us all and greetings success always for you.
Keep update more information..

Nice blog..! I really loved reading through this article. Thanks for sharing such a
amazing post with us and keep blogging... best angularjs training institute in chennai | angularjs training in omr | Nice blog..! I really loved reading through this article. Thanks for sharing such a
amazing post with us and keep blogging... best angularjs training institute in chennai | angularjs training in omr | angular 4 training in chennai | angularjs training in omr

Add new comment