change_field_type
void change_field_type( string $field , string $field_type [ , string $value ] )
Quick Description: Changes the default field type
This method has been deprecated and it is highly recommended to use field_type instead that works with the exact same way .
For example when we have:
$crud->field_type('field_name', 'password');
$crud->change_field_type('field_name', 'password');