Together with Vladimir Statsenko, they made a rather detailed comparison of the popular PHP IDE.
The comparison included: Eclipse PDT, Zend Studio, NetBeans and Aptana.
Definitely the best IDE will not be called: for someone the main one, for another - the other. Determine yourself.
HTML version of the fixed-title signage
PDF version
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UPDATE
Shared the
source in Google Docs for all to read . There are more recent data, where comments are taken into account, and the dev-version of NetBeans 7 is also added.