I’ve cleaned up your code a little bit and added a name to the function, now I see hello in the browser. The function also needs to return rather than echo, because you can then echo the function like echo test(). This should sort your problem:
<?php
$response = array();
function test() {
global $response;
$response['res'] = "hello";
return json_encode($response);
}
echo test();
?>
Full HTML code that should be placed in a .php file:
<!DOCTYPE html>
<html>
<body>
<?php
$response = array();
function test() {
global $response;
$response['res'] = "hello";
return json_encode($response);
}
echo test();
?>
</body>
</html>
And output in the browser:
