mysqli_insert_id()
跟在数据库插入动作后面，返回刚插入数据库的auto_increment字段
例：
$conn = mysqli_connect(localhost,root,cimg123);
mysqli_select_db($conn,test);
$sql = "insert test (username) values ('cimg')";
$result = mysqli_query($conn,$sql);
$id = mysqli_insert_id($conn);
echo $id;
mysqli_close($conn);
?>
或者
$conn = new mysqli(localhost,root,cimg123,test);
$sql = "insert test (username) values ('cimg')";
$result = $conn->query($sql);
$id = mysqli_insert_id($conn);
echo $id;
$conn->close();
?>
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