function say(){
$test= $_GET["a"];
if (empty($test)) {
$data["result"]=(string) 2; echo json_encode($data);exit;
}else{
$data["result"]=(string) 1;echo json_encode($data);exit;
}
}
say();
? >
The above introduces the interface provided by PHP for the app to carry parameters and return them, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
