[PHP] silly question: an IDE for php?

[Zhang Weiwu]

Not to start flame. I have been writing php using just vim for some 
time, it is a waste of time to put 'echo' statement everywhere to track 
variable values. I wonder what do the experienced users on php.net use 
for php development? Do you use IDE? Do you use Zend?

Is there an alternative free (free as in 'beer') IDE rather than Zend 
that I can use to track variables, analize code and so like? I heard of 
bluefish, is it widely used?

Thank you.
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