CSS Media queries versus a PHP mobile detect script?

Hi,
I have one website that will be used for all devices, desktops, tablets & mobile devices.
Only the css will be modified to hide or override existing styles when tablets or mobile devices are used.

Is it better to use media queries as shown below to include additional style sheets for tablet and mobile devices and specify display:none for the elements I wish to hide in the mobile and tablet forms and override styles for the tablet and mobile forms?


<link href="/styles/desktop.css" rel="stylesheet" type="text/css" media="screen, projection" />
<link href="/styles/tablet.css" rel="stylesheet" type="text/css" media="all and (min-width: 481px) and (max-width: 768px)" />
<link href="/styles/mobile.css" rel="stylesheet" type="text/css" media="all and (min-width: 0px) and (max-width: 480px)" />


Or should I just use a  php mobile detect script such as http://code.google.com/p/php-mobile-detect/downloads/list and load just one css file?


<?php  require_once 'Mobile_Detect.php';
       $detect = new Mobile_Detect();
       $layout = ($detect->isMobile() ? ($detect->isTablet() ? 'tablet' : 'mobile') : 'desktop');
?>
           
<link href="/styles/<?php echo $layout; ?>.css" rel="stylesheet" type="text/css" media="screen, projection" />

What are the pros and cons of either choice

Thanks in advance for your feedback.
sabecsAsked:
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Ray PaseurCommented:
One advantage of the Mobile_Detect() approach is that your server will be sending less data to the device.
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LZ1Commented:
Standards would have you use the CSS media queries.  Which may save development time/overhead and server cost.  The browser will be responsible for rendering the elements through the media query. If you use PHP, obviously the server will be responsible for the detection.

What would you be more comfortable maintaining over time? I personally use media queries for several different reasons. The main one is that I'm a front-end guy who'd rather not mess around with PHP if I had a choice. I have used both and CSS is far easier/better IMHO.
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sabecsAuthor Commented:
I previously had my style sheets split into smaller manageable files such as main.css, menu.css, products.css, gallery.css etc which made things easy to find and alter styles. If I use media queries I will have to combine into one large file such as desktop.css which will make it was more difficult to locate a specify style?

Are there any other disadvantages to using a PHP detection script?
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Ray PaseurCommented:
The process of taking smaller manageable files and combining them into one large file is something you can automate.  In computer science it's called a "build" and a one-click build is a really useful tool for speeding up your testing.  Just a thought, ~Ray
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LZ1Commented:
You could just add the media queries to each file for that specific css.  But, I do agree with Ray, in that you could "build" the files on the fly.  

Just to reinforce the media queries though, when your doing them you may not need to include all of your styles.  Remember, it's more about usability and user experience then anything else.
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sabecsAuthor Commented:
Thanks for your comments, much appreciated..
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Ray PaseurCommented:
Thanks for the points - there is always more than one way to skin a cat, and this is a great question!  Best, ~Ray
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