Here's what's going on behind the scenes in PHP: https://gist.github.com/4372596 https://gist.github.com/4372596 (Taken from https://github.com/php/php-src/blo

Here's what's going on behind the scenes in PHP: https://gist.github.com/4372596 https://gist.github.com/4372596 (Taken from https://github.com/php/php-src/blob/PHP-5.4.9/ext/standard/string.c https://github.com/php/php-src/blob/PHP-5.4.9/ext/standard/s... )