PHP class for dynamic generation of a single javascript resource from multiple javascript files
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PHP-JSLoader is intended to help websites that are constantly being developed and modified.
Basically, JSLoader is used to combine multiple javascript files into one web-readable resource. This gives both flexibility and performance when the website and JS scripts are constantly changing.

How does it work?
On first load, JSLoader will generate one javascript file for any combination of multiple js files (order doesn’t count…) and store it on a web available space.
On the following requests, JSLoader will search if a combine file exists for the requested combination. If it does, it will serve it rather than re-generating it.

Why is it good for me?

	1.	The client loads only one JS file, no matter how many JS file the system is composed of.
	2.	If the developer change the a single byte in one JS file, the whole combination will be regenerated. This will keep your client updated while avoiding the browser cache, as the new combination has a new filename.
	3.	You may integrate text filters and modifiers that will work each time a combination is generated. You may, for example, minify the newly generated code.


	1.	Create a web-available folder for the generated Javascript files.
	2.	Give the above folder write permissions for PHP. 
	3.	Copy the JSLoader package to your project.

	1.	First include or require the class file:
		require_once '../lib/JSLoader.php';
	2.	Everywhere we want to use this class, we have to retrieve its instance:
		$jsloader = JSLoader::getInstance();
	3.	Next, we do one-time configuration:
		The first line sets the absolute path to where the combined JS files will be placed.
		The second line sets a web available URL to the same directory.
	4.	Now here is the real thing! Everywhere you want to "include" a javascript file, you do:
		The above line should go each time you need to include a js file and
		you should pass the absolute path to that file.
		Also remember to retrieve the class's instance when needed. See section 2.
	5.	Finally, you should place a <script> tag to include the generated combined JS file.
		Fortunately, JSLoader does it for you. Just place this code (once) where needed:
	Check your page source to see if the file was included and that it's available.