Definition and Usage
定义和用法

The mysql_insert_id() function returns the AUTO_INCREMENT ID generated from the previous INSERT operation.
mysql_insert_id()函数的作用是：取得上一步 INSERT 操作产生的 ID。

This function returns 0 if the previous operation does not generate an AUTO_INCREMENT ID, or FALSE on MySQL connection failure.
如果先前的操作不产生一个自动增加的ID[AUTO_INCREMENT ID]，那么，函数返回0；如果MySQL连接失败，将返回False。

Syntax
语法

mysql_insert_id(connection)

Tips and Notes
注意点

Note: Be sure to call mysql_insert_id() immediately after a query to get the correct value.
注意：你必须确定已经在一条查询语句之后请求了mysql_insert_id()函数以获取正确的值。

Example
案例

<?php
$con = mysql_connect("localhost", "peter", "abc123");
if (!$con) { die('Could not connect: ' . mysql_error()); }

$db_selected = mysql_select_db("test_db",$con);

$sql = "INSERT INTO person VALUES ('Børge','Refsnes','Sandnes','17')";
$result = mysql_query($sql,$con);
echo "ID of last inserted record is: " . mysql_insert_id());

mysql_close($con);
?>

The output of the code above could be:
上述代码将输出下面的结果：

ID of last inserted record is: 5

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