mysql_insert_id() returns the ID
generated for an AUTO_INCREMENT column by the previous INSERT
query using the given
link_identifier. If
link_identifier isn't specified, the last opened
link is assumed.
mysql_insert_id() returns 0 if
the previous query does not generate an AUTO_INCREMENT value.
If you need to save the value for later, be sure to call mysql_insert_id() immediately after the
query that generates the value.
注: The value of the MySQL SQL function LAST_INSERT_ID() always contains the most recently generated AUTO_INCREMENT value, and is not reset between queries.
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See also: mysql_query().