Question

preg_replace(array('#/(.?)#e', '/(^|_|-)+(.)/e'), 
            array("'::'.strtoupper('\\1')", "strtoupper('\\2')"), $text);

I’ve never used regex this way,how does it work?

Answer 1

Does it even work?

echo camelize('http://google.com/');

Result:

Http:::/google.com::

Most of how it “works” can be found on the documentation for preg_replace. It uses the array form to make multiple replacements (see example 2). It uses the e switch to execute PHP code instead of making a string replacement.