<img src="<?php echo 'data:image/jpeg;base64,'. $student_info_arr['retdata']["xp"]?>">
$student_info_arr['retdata']["xp"] = "/9j/4AAQSkZJRgABAQEBXgFeAAD/2wBDAAMCAgMCAgMDAwMEAwMEBQgFBQQEBQoHBwYIDAoMDAsKCwsNDhIQDQ4RDgsLE...60UH+p/maKFqJn/2Q=="
这一大串串就是base64格式的图片
不积跬步,无以至千里,不积小流,无以成江海