"... should be obvious - but are often overlooked - points within coding
practice that can cause the programmer to develop bad habits and bad
code." - Dan Brown

Tip #1:

Don't use count() in loops unless there are very few items to count and
performance doesn't matter, or the number will vary over the loop. That
is, don't do this:

for ($i = 0; $i < count($items); $i++)

Instead, do this:

$number = count($items);
for ($i = 0; $i < $number; $i++)

Reason: when you use the count() call at the top of the loop, it will
re-evaluate the number of items each time it's called, which usually
isn't necessary and adds time. Instead, work out the number of items
before going into the loop and simply refer to that for the number of
items in controlling the loop.


Paul M. Foster

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