Best practice in how to organize ajax server-side pages

I am using an old phpbb framework for a website.  We've only just 'discovered' AJAX and are intending using it to update the site a bit.

With phpbb the basic file structure for each page of output is like this (eg: xyz.php)
1) main php files are in the root: \\xyz.php
2) functions are all in included files: \\include\function_xyz.php
3) template files are located: \\templates\myTheme\template_xyz.tpl

Is there a best practice (or even your own prejudice?) on where I should be putting functions/pages that I am calling from AJAX (eg: from the xyz.php HTML page)?

eg:
1) create a folder \\ajax\ajax_xyz.php, and call this from the UI
2) put the function which returns data to the ui in \\include\function_xyz.php, called from \\xyz.php, which in turn is called from the UI
3) etc etc...
LVL 6
PaultheBrokerAsked:
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Olaf DoschkeConnect With a Mentor Software DeveloperCommented:
Are you talking about what php script you would requestvia javascript xmlhttprequests? Requests you make would depend on the functionality you need and the data you want to retrieve. That would seldom be one php script per php page, but one per topic, functionality, etc.

Eg a cascaded choice of a users city could be done by:
1. Initially giving the choice for a continent.
2. After the user selects a continent, calling getcountries.php, returning a list of countries of the choosen continent.
3. After the user selects a country, calling getcities.php, returning a list of the cities of a choosen country.

That's already a case of calling back into two different php scripts.

These two methods could of course be part of one \\ajax\ajax_xyz.php analog to \\include\function_xyz.php, but why would things you request from UI not also be \\include\function_xyz.php and if you think OOP and make use of MVC design pattern, this could also be done for ajax, all ajax calls could go into one ajax controller, which redirects and reuses view and model components to generate html snippets or return some data in the form of json or xml instead of a php array.

Bye, Olaf.
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Ray PaseurCommented:
I think I would go with #1.  My instincts tell me that will give you better organization.  But leave the question open for a day or so - there will be other opinions and suggestions from other experts.
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designatedinitializerCommented:
I'm with Ray on this.
I'd go with #1.
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PaultheBrokerAuthor Commented:
I like the per topic suggestion - its is how the includes are organized (mostly!)
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