PHP interface problem - class not found
Hi I have a very simple class that implements an interface. Both the class and the interface are in the same file.
When I implement the interface I get a fatal error "Class not found", but when I remove the imple开发者_如何学Goments and then try to use the class I can use it fine???
Can anyone offer any advice on this?
Sorry here is some code that I am using to test at the moment:
$tester = new TypeOneTester();
$tester->test("Hello");
interface iTestInterface
{
public function test($data);
}
class TypeOneTester implements iTestInterface
{
public function test($data)
{
return $data;
}
}
Create an instance of your class after the class and the interface are defined, not before.
The order of definition in this case should be:
- Interface
- Class
- Instance of Class (objects)
This is a (very poorly) documented limitation:
http://php.net/manual/pl/migration5.incompatible.php
In some cases classes must be declared before use. It only happens if some of the new features of PHP 5 (such as interfaces) are used. Otherwise the behaviour is the old.
I've filed a bug report nonetheless. IMO it should be fixed as it's inconsistent behaviour and the error message is not helpful for anyone who assumes as I did that PHP simply didn't care where you declare functions/classes. Come on, it's been there for over 10 years now...
https://bugs.php.net/bug.php?id=69665
smells like a bug in php. Make sure it's reproducible with the latest version and post to bugs.php.net.
Reproduce code
interface I {}
$a = new A;
$b = new B;
class A {
function __construct() { echo 'A'; }
}
class B implements I {
function __construct() { echo 'B'; }
}
Expected
AB
Actual:
A
Fatal error: Class 'B' not found...
That is because, php loading interface, and instantiate class class class object where there is a certain order and must be in a Php file, if the file is not in accordance with an order of 1. Require_one interface, 2. Require_one class
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