Verificar si el correo existe en la base de datos

[NueveReinas]

Era tan simple como buscar en Google "check if record exists mysql pdo"

http://stackoverflow.com/questions/1...k-if-row-exist
http://stackoverflow.com/questions/2...ord-exists-pdo
http://stackoverflow.com/questions/3...-if-row-exists
https://gist.github.com/devluis/7539161