The ability to transfer your existing PHP skills direct to the CLI SAPI means that you can make the switch with the minimum of fuss: nearly everything you have learnt to far can be used immediately from the command line.
It is probable that only time and experience will allow you to fully take advantage of the CLI SAPI - certainly, the more you play around with it, the more you will think up new ideas for it. Given time, I can see the CLI SAPI slowly eating away at Perl's market share; make sure you are one of the first on the bandwagon!
Author's Note: Just as a small side note, both Zend Performance Suite and IonCube PHP Accelerator do not cache CLI scripts, so you should not expect any application speed-ups here.
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