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    <p>To get the viewport size, you must use Javascript, yes. For examples of code doing that (not always easy, there are differences between browsers), you can take a look at how JS Frameworks/Libraries determine that size (for instance, in prototype.js, there is a <a href="http://www.prototypejs.org/api/document/viewport/getDimensions" rel="nofollow noreferrer">getDimensions</a> function that does what you want) ; google will get you lots of results about that too (<a href="http://andylangton.co.uk/articles/javascript/get-viewport-size-javascript/" rel="nofollow noreferrer">this one</a> is an example of those results)</p> <p>Then, you must send that size to PHP. For that, two solutions :</p> <ul> <li>One is to use an Ajax request (sending the width and height as parameters)</li> <li>The other is to dynamically build an <code>&lt;img&gt;</code> tag, with an URL pointing to the PHP script, like <code>'http://.../size.php?w=WIDTH&amp;h=HEIGHT'</code> <ul> <li>many statistic software (things like xiti / google analytics -- not sure if those ones do ^^ ) use that kind of method.</li> </ul></li> </ul> <p>In the second case, the JS code could look like this :</p> <pre><code>&lt;script type="text/javascript"&gt; var width = 100; var height = 80; var tag = document.createElement('img'); // Create the tag tag.src = 'http://tests/temp/viewport/size.php?'; tag.src += 'w=' + width; // Pass the size tag.src += '&amp;h=' + height; document.body.appendChild(tag); // Insert the tag into the page &lt;/script&gt; </code></pre> <p>And then, in size.php, you use $_GET['w'] and $_GET['h']. Note : you will probably have to return some valid image data from size.php, to not get a "red cross" picture (a transparent gif, 1x1 in size, for instance, will do the trick)</p>
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    1. PODetect Visitor Browser view port size with Javascript and Save to a PHP variable
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    1. USPascal MARTIN
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    1. COJust as a side note : to avoid doing that request to size.php over and over again on every page of your site, you probably can store (in session for instance) the fact that the viewport's size is already known for a user, and that it is not necessary to recalculate/refetch it on next pages...
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      1. USPascal MARTIN
    2. COI've tried it. And worked out. But the widht and height values they aper in the navigation bar. There is a way they don't appear on it?
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      1. USFábio Antunes
    3. COin the navigation bar ? using an img tag, the user should not see the URL called (except if he looks with something like firebug, or watch the requests made from the page). Even if the user sees the parameters, is it really that bad ?
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      1. USPascal MARTIN
 

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