Actually, you can't use all available memory with PHP - the memory is limited to a setting in php.ini (8Mb default, I think). As for consuming all CPU, the execution time is also limited to a set amount of time (30 seconds default). Leaking memory is another fun thing you can do with mod_perl but not with PHP - or that used to be the big complaint, years ago. Plus, IIRC apache+php is a more lightweight binary than apache+mod_perl - taking less memory means you can handle more connections before swapping out. And since there are fewer useful modules/classes to use, PHP code tends to be leaner and meaner, so it usually executes more quickly. PHP partially makes up for this lack by having a(n inconsistently named) function for absolutely everything (this is also a weakness).
Ok, I admit it - I use PHP (not by choice - it's the company standard at my work). I feel so *dirty* - I wash and I wash, but I can't get my namespace clean...
Obviously mod_perl is much more powerful - but with great power comes great responsibility - and that's in short supply.
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