获取自动增长IDmysqli函数

<?php
$mysqli=@new mysqli("localhost", "root", "123456", "xsphpdb");

if(mysqli_connect_errno()){
echo "连接数据库失败：".mysqli_connect_error();
$mysqli=null;
exit;
}

//select语句（结果集）， 非select语句，会影响行数

$sql="insert into shops(name,price,num,desn) values('hello','34.56','22','good123')";
//$sql="delete from shops where id > '80'";

$result=$mysqli->query($sql);

if(!$result){
echo "SQL语句有误<br>";
echo "ERROR:".$mysqli->errno."|".$mysqli->error;
exit;
}

if($mysqli->affected_rows > 0){
echo "有行数被影响<br>";
}

echo "最后自动增长的ID:".$mysqli->insert_id;

$mysqli->close();