note 83678 added to function.mysql-insert-id

For the sake of clarification above with regard to transactions, let's say I have these three tables: T1, T2, T3. T1 has an auto_increment column "auto", all other columns in T1, T2, and T3 have static content. With this code I always get unique numbers even if I have several browser windows open and hit my PHP script all at the same time: <?php $result = mysql_query("BEGIN", $connection); $result = mysql_query("INSERT INTO T1 (static1) VALUES ('test')", $connection); $result = mysql_query("SELECT LAST_INSERT_ID()", $connection); $insert_id = mysql_result($result, 0); echo $insert_id; sleep(15); $result = mysql_query("INSERT INTO T2 (static1, static2) VALUES ($insert_id, 'test$insert_id')", $connection); $result = mysql_query("INSERT INTO T3 (static1, static2) VALUES ($insert_id, 'test$insert_id')", $connection); $result = mysql_query("COMMIT", $connection); ?> So then my question is this. Is it true that even though I have not committed anything, a call to LAST_INSERT_ID() will ALWAYS give me the last insert id, even of other connections that have not committed yet. In other words, if I have 100 clients hitting the above script at the same time, all of them calling LAST_INSERT_ID before any of them commit anything, they should all still get unique IDs? That's what I'm seeing when I run my mini-tests, but I just want to clarify. I haven't been able to find a whole lot of clear concrete information regarding this function and transactions. If someone could clarify this point with regard to how IDs are distributed, and what they mean when they say it's on a "per connection" basis, that would be great! ---- Server IP: 66.207.199.35 Probable Submitter: 69.158.1.51 ---- Manual Page -- http://www.php.net/manual/en/function.mysql-insert-id.php Edit -- https://master.php.net/note/edit/83678 Del: integrated -- https://master.php.net/note/delete/83678/integrated Del: useless -- https://master.php.net/note/delete/83678/useless Del: bad code -- https://master.php.net/note/delete/83678/bad+code Del: spam -- https://master.php.net/note/delete/83678/spam Del: non-english -- https://master.php.net/note/delete/83678/non-english Del: in docs -- https://master.php.net/note/delete/83678/in+docs Del: other reasons-- https://master.php.net/note/delete/83678 Reject -- https://master.php.net/note/reject/83678 Search -- https://master.php.net/manage/user-notes.php