emoji not storing inside codeigniter
1) Ensure you're using MYSQL 5.5 only then will you be able to change the
collation to utf8mb4_something
2) Ensure table columns that are going to receive emoji have their collation
set to utf8mb4_something
3) Edit your database.php config file
$db['default']['char_set'] = 'utf8mb4';
$db['default']['dbcollat'] = 'utf8mb4_unicode_ci';