Re: Negative string offsets

On Thu, 2014-04-17 at 17:18 +0300, Andrey Andreev wrote: > For example, every time you need to check for a filename extension, > last segment of a path, etc. When I need that, I always endup with > substr(), strrchr() or explode(), end() ... both are suboptimal. I don't see where this helps in that case. $sep = strrpos($filename, "."); if ($sep !== false) { $ext = substr($filename, $sep + 1); } is clear and concise, two fcalls, can be understood even after years and the new programmer easily. This is the most concise form I came up using this new offset: $ext = ''; $pos = -1; do { $ext = $filename[$pos].$ext; } while ($filename[--$pos] != '.'); While this form is bugged as it assumes that there is a . without checking. For checking I'd have to use strlen(), but if i call strlen() I can also initialize $pos accordingly and iterate from strlen() to 0. Also this form does more comparisons and way more allocations and is (in my opinion) way harder to understand. Maye I didn't see a simple form ... johannes