PHP case-insensitive explode()

Just use preg_split() and pass the flag i for case-insensitivity:

$keywords = preg_split("/your delimiter/i", $text);

Also make sure your delimiter which you pass to preg_split() doesn't cotain any sepcial regex characters. Otherwise make sure you escape them properly or use preg_quote().

You can first replace the delimiter and then use explode as normal. This can be done as a fairly readable one liner like this:

explode($delimiter,str_ireplace($delimiter,$delimiter,$snippet));