I’m working on some PHP code right now, and I need to split a URI path and recombine it with some changes. However, I ran into an issue using explode. This is what I had:
$parts = explode('/',$path);
This worked as expected, unless the URI ended with a ‘/’, in which case I ended up with an empty string as the last item. Also, if it started with a ‘/’ then I’d get an empty string at the start. I decided to fix this using array_filter with the default predicate, like so:
$parts = array_filter(explode('/',$path));
Job done, right? Nope! Turns out array_filter doesn’t reindex anything, so my array ended up with no  entry, and $parts[count($parts)-1] didn’t return the last entry anymore. I needed to rebuild the array with new indexes. Solved it by using array_values like so:
$parts = array_values(array_filter(explode('/',$path)));
If it was mission critical, maybe it would be more efficient to create an iterator that loops over the exploded array and appends any non-zero length strings to a new array, but I’ll save that for another day.