[http://srikavin.me/blog/posts/asisctf20-abusing-php-constants-to-bypass-eval-filters/](http://srikavin.me/blog/posts/asisctf20-abusing-php-constants-to-bypass-eval-filters/)

Original writeup (http://srikavin.me/blog/posts/asisctf20-abusing-php-constants-to-bypass-eval-filters/).