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    <p>Better solution I usually go for: Create the thumbnails dynamically when needed, not upon upload.</p> <p>You create a script that generates thumbnails on the fly, and all your image tags point to this script:</p> <pre><code>&lt;img src="/thumbnail.php?image=foobar.jpg&amp;size=150" /&gt; </code></pre> <p>This delays the thumbnail generation until it is needed and works "asynchronously". With some .htaccess rewrite magic you can even make it look like a normal image file and cache images in a way that the Apache server will serve them the next time without invoking the script.</p> <hr> <p>To be a little more detailed, I use this for user profile images:</p> <p>Image tags:</p> <pre><code>&lt;img src="/img/users/123456/50.jpg" /&gt; </code></pre> <p>.htaccess:</p> <pre><code>&lt;IfModule mod_rewrite.c&gt; RewriteEngine On # Rewrites requests for user images to match directory structure. # E.g.: URL /img/users/123456/50.jpg -&gt; /img/users/123/123456/50.jpg # Intermediate directory level is introduced to avoid cramming too many directories into the same directory. RewriteRule ^img/users/(\d{1,3})(\d*)/(\d+\.\D+)$ img/users/$1/$1$2/$3 [nocase,last] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] &lt;/IfModule&gt; </code></pre> <p>This first of all rewrites image requests to a deeper directory structure. If the image exists, Apache will serve it as usual. If it doesn't, my regular application is invoked. In the app, I route <code>/img/users/...</code> URLs to a module that ends up with two pieces of information: the user id <code>123456</code> and the requested size <code>50</code>. It then generates a thumbnail roughly according to this logic:</p> <ol> <li>Find profile image for user <code>123456</code></li> <li>Generate thumbnail in requested size</li> <li>Write thumbnail to <code>/img/users/123/123456/50.jpg</code>, where it will be picked up by Apache next time</li> <li>Output image</li> </ol>
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    1. COThat could really slow down things if lots of images are getting uploaded very frequently... batch is the way to do this, IMPO.
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    2. CO@xil3 It doesn't really make any difference, the server will be busy either way. Just the point in time changes, not the actual workload. It also makes sure that images are available when needed, unlike the cron job which delays the availability of the images. Proper caching of course is a must, as I wrote.
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    3. COYeah, I guess a pairing of the 2 solutions would be best - just in-case the images haven't been processed by the batch yet.
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