Be careful if you're using count in a loop. Example:
$arr ends at index number 25 (or $arr[25])
We know there are actually 26 elements when we include
element 0 (as we should). This is what count is going to
return back. But if we do this:
for ($i = 0; $i < count($arr); i++) {
This loop is going to try to traverse to $arr[26] which does
not exist. The last element is at index number 25. We can
fix this with a minor edit:
for ($i = 0; $i < count($arr)-1; i++) {
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