PHP mysqli_insert_id()Function

PHP MySQLi 参考手册PHP MySQLi Reference Manual

Assume the websites table has an auto-generated ID field. Returns the ID from the last query:

<?php 
// 假定数据库用户名：root，密码：123456，数据库：EXAMPLE 
$con=mysqli_connect("localhost","root","123456","EXAMPLE"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 

mysqli_query($con,"INSERT INTO websites (name,url,alexa) 
VALUES ('Example','http://www.example.com',5633)");

// 输出自动生成的 ID
echo "新 id 为: " . mysqli_insert_id($con); 

mysqli_close($con);
?>

Definition and Usage

The mysqli_insert_id() function returns the ID auto-generated in the last query (generated by AUTO_INCREMENT).

Syntax

mysqli_insert_id(connection);

Parameters Description
connection Required. Specifies the MySQL connection to use.

Technical Details

Return value: Returns an integer with the AUTO_INCREMENT field value auto-generated in the last query. If the number > maximum integer value, it returns a string. If there is no update or no AUTO_INCREMENT field, it returns 0.
PHP Version: 5+

PHP MySQLi 参考手册PHP MySQLi Reference Manual Other Extensions