On site http://trac.pradosoft.com/wiki/Development/CodingGuidelines we can find some PHP coding tips:

These are all small gotchas. You can get more details about them in the references below. * ++$i is better than $i++ * for($i=0, $k=count($j); $i<$k; ++$i) is better than for($i=0; $i * ctype_digit($foo) is better than preg_match("![0-9]+!", $foo) * if(isset($array['key'])) is better than if(in_array('key', $keys)) * if(!isset($foo{5})) is better than if(strlen($foo) < 5) * echo is better than print * true is better than TRUE * false is better than FALSE * null is better than NULL References 1. PHP Optimization Tricks by Ilia Alshanetsky 2. Optimizing PHP Scripts by Leon Atkinson

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