pg_query, pg_query_params or PDO

[Ashkar Dev <ashkardev@xxxxxxxxx>]

Hi,

I have developed a web application, I used (pg_query) for working with the database:

1. should I convert all (pg_query) to (pg_query_params) or to (PDO)?

2. whats different between all these three types?

3. when it is necessary to use (pg_prepare)?

Thanks.