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copied!<p>PHP is compiled into bytecode, which is then interpreted on top of something resembling a VM. Many other scripting languages follow the same general process, including Perl and Ruby. It's not really a traditional interpreted language like, say, BASIC.</p> <p>There would be no effective speed increase if you attempted to "minify" the source. You would get a major increase by using a <a href="http://pecl.php.net/package/APC" rel="noreferrer">bytecode cache like APC</a>.</p> <p>Facebook introduced a compiler named <a href="http://github.com/facebook/hiphop-php/wiki" rel="noreferrer">HipHop</a> that transforms PHP source into C++ code. Rasmus Lerdorf, one of the big PHP guys did a <a href="http://talks.php.net/show/digg" rel="noreferrer">presentation for Digg earlier this year</a> that covers the performance improvements given by HipHop. In short, it's not too much faster than optimizing code and using a bytecode cache. HipHop is overkill for the majority of users.</p> <p>Facebook also recently unveiled <a href="https://www.facebook.com/note.php?note_id=10150415177928920" rel="noreferrer">HHVM</a>, a new virtual machine based on their work making HipHop. It's still rather new and it's not clear if it will provide a major performance boost to the general public.</p> <p>Just to make sure it's stated expressly, please read <a href="http://talks.php.net/show/digg" rel="noreferrer">that presentation</a> in full. It points out numerous ways to benchmark and profile code and identify bottlenecks using tools like <a href="http://xdebug.org/" rel="noreferrer">xdebug</a> and <a href="http://pecl.php.net/package/xhprof" rel="noreferrer">xhprof</a>, also from Facebook.</p>

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