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# mysql_insert_id

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

mysql_insert_id -- Get the id generated from the previous INSERT operation

## Description

``int mysql_insert_id` (resource [link_identifier])`

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.

> Note: 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.

Warning
mysql_insert_id() converts the return type of the native MySQL C API function `mysql_insert_id()` to a type of `long` (named int in PHP). If your AUTO_INCREMENT column has a column type of BIGINT, the value returned by mysql_insert_id() will be incorrect. Instead, use the internal MySQL SQL function `LAST_INSERT_ID()` in an SQL query.

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