stmt_init() seems to clear previous (possibly erroneous) results on the DB connection, which means you don’t necessarily need to use it but it could make the code more robust. In a PHPUnit test, I had a sequence of prepared queries on the same connection. One of them fetched a row from a SELECT but didn’t keep fetching until it drained the connection, so it left some stale results. When the next query did this: getConnection()->getDbConnection(); $preparedQuery = $db->prepare ($query); ?> the prepare() call generated an error: „Could not prepare query: Commands out of sync; you can’t run this command now.“ Changing to this: getConnection()->getDbConnection(); $preparedQuery = $db->stmt_init(); $preparedQuery->prepare ($query); ?> resolved the problem.
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