In cust.php you actually need to call the function as well
<?php
header('Content-Type: application/json');
function testdata(){
$str="{"employees":[{"firstName":"John", "lastName":"Doe"},{"firstName":"Anna", "lastName":"Smith"},{"firstName":"Peter", "lastName":"Jones"}]}";
return $str;
}
echo testdata();
?>
EDIT: I’ve had to change your $str as well, single quote surrounding keys and values are not valid, I have changed it to double quotes ” which are valid.
As @charlietfl has stated it’s better practice for you to json_encode your JSON response instead of writing it yourself.
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