While it's usually fine without it, you can and should set theContent-Typeheader:
If I'm not using a specific framework, I usually allow some request parameters to modify the output behavior. Often for quick troubleshooting it can be useful to not send the header, or sometimesprint_rthe data payload to observe it (although in most cases this is not necessary).
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The complete and clear PHP code that returns JSON is:
$option = $_GET['option']; if ( $option == 1 ) { $data = [ 'a', 'b', 'c' ]; // will encode to JSON array: ["a","b","c"] // accessed as example in JavaScript like: result[1] (returns "b") } else { $data = [ 'name' => 'God', 'age' => -1 ]; // will encode to JSON object: {"name":"God","age":-1} // accessed as example in JavaScript like: result.name or result['name'] (returns "God") } header('Content-type: application/json'); echo json_encode( $data );While it's usually fine without it, you can and should set the
Content-Typeheader:If I'm not using a specific framework, I usually allow some request parameters to modify the output behavior. Often for quick troubleshooting it can be useful to not send the header, or sometimes
print_rthe data payload to observe it (although in most cases this is not necessary).