PHP - Function inside a Function. Good or bad?

Question

I would like to know if it is a good thing to define a function inside another function in PHP. Isn\'t it better to define it before the function (and not inside) in terms o

Answer 1

There are multiple reasons against it:

• The documentation of the inner function will not be parsed.
• The inner function only exists after the outer function has been called (but even outside the scope of the outer function afterwards)
• It is hard to read (because it is not seen commonly)
• The only advantage I could think of is defining a callback, but this is better done with create_function() () or closures (>=PHP5.3)
• If you're concerned about performance on this level, you should really be using another language