symfony3.3 set charset utf8

si usas xampp:

ir a C:\xampp719\mysql\bin\my.ini

y en
[mnysqld] agregar las sgts lineas:

[mysqld]
# Version 5.5.3 introduced "utf8mb4", which is recommended
collation-server     = utf8mb4_unicode_ci # Replaces utf8_unicode_ci
character-set-server = utf8mb4            # Replaces utf8