Description:
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I tired with stored procedures and it did not worked out.
here is what i tried:

$mysqli = connection1();
$mysqli->autocommit(FALSE);
$user = "call insert_user('hello', 'mypass','myemail')";
$mysqli->query($user);
printf ("New Record has id %d.\n", $mysqli->insert_id);
$mysqli->commit();
exit;

Output:
New Record has id 0.
which is not correct, may be problem is with stored procedures.

Reproduce code:
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$mysqli = connection1();
$mysqli->autocommit(FALSE);
$user = "call insert_user('hello', 'mypass','myemail')";
$mysqli->query($user);
printf ("New Record has id %d.\n", $mysqli->insert_id);
$mysqli->commit();
exit;

Expected result:
----------------
the id number

Actual result:
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0