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();