after i have finished with my result set from a active record query in a CodeIgniter model, should I use $query->free_result()
or does ActiveRecord automatically do that?
PHP will clean up everything after your script is done. However, if you have lots of queries in, say, a loop, the results will not be cleaned up after each iteration.
So, if you run lots of queries in a loop, you probably will want to free_result() to clear up memory. Otherwise, it's not necessary. See here for details:
https://www.codeigniter.com/user_guide/database/results.html
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