Check out which types those examples get cast to and it should make more sense :...

seanp2k2 on May 4, 2015 | parent | context | favorite | on: PHP: md5('240610708') == md5('QNKCDZO')

Check out which types those examples get cast to and it should make more sense :) I don't know the exact rules for type detection in PHP, but it looks like that's the cause.