PHP + SQL - insert value of primary key to another field in the same row

Question

I need to insert a row to table where second element of the row (chatID) copies value of auto incremented primary key (messageID).

safe_query("INSERT INTO ".PREFIX."messenger ('messageID', 'chatID') VALUES('','')");

Any ideas would be very helpful. Thanks.

Answer 1

In php when you inserted the record get the lastInsertId(); and update the chatID

$inserted_id = $pdo->lastInsertId();

$sth2 = $pdo->prepare("UPDATE ".PREFIX."messenger 
SET `chatID`= $inserted_id WHERE `messageID`=$inserted_id");
$sth2->execute();