I've encountered a strange problem.
The code pasted below works in HHVM (version 3.1.0) but it fails in PHP (version 5.5.9) with a very strange error message.
<?php
namespace DummyTest\Lib {
class TObject {
public function __construct() {
}
}
class TComponent extends \DummyTest\Lib\TObject {
public function __construct() {
parent::__construct();
}
}
class TSingletonComponent extends \DummyTest\Lib\TComponent {
public function __construct() {
parent::__construct();
}
}
class TDatabase extends \DummyTest\Lib\TSingletonComponent {
public function __construct() {
parent::__construct();
}
public static function Init() {
$db = new \DummyTest\Lib\Database\TPDO();
}
}
}
namespace DummyTest\Lib\Database {
class TDatabase extends \DummyTest\Lib\TComponent {
public function __construct() {
parent::__construct();
}
}
class TPDO extends \DummyTest\Lib\Database\TDatabase {
protected $pdo;
public function __construct() {
parent::__construct();
echo \DummyTest\SystemConfig::Get('xxx'); // <-- This fails in PHP
}
}
}
namespace DummyTest {
class SystemConfig {
protected static $config = array();
public function Get($name) {
echo get_called_class().PHP_EOL;
if(isset(static::$config[$name])) {
return static::$config[$name];
}
return null;
}
public function Set($name, $value) {
static::$config[$name] = $value;
}
}
SystemConfig::Set('xxx', 'yyy');
\DummyTest\Lib\TDatabase::Init();
}
When I run this code in HHVM it correctly responds 'yyy'.
But in PHP I get the following error message: "PHP Fatal error: Access to undeclared static property: DummyTest\Lib\Database\TPDO::$config in /home/.../bugtest/staticclass.php on line 50"
I can't see why it fails. The class \DummyTest\SystemConfig doesn't inherit from any class and the class \DummyTest\Lib\Database\TPDO doesn't inherit from \DummyTest\SystemConfig. So why does PHP fail?
If I change static::$config[$name] in \DummyTest\SystemConfig to self::$config[$name] it works as expected in both PHP and HHVM.
This code is extracted from a larger project. But the extracted code behaves identically to the larger project.
More information about the current environment is that it is a computer running Ubuntu 14.04 and the code is executed from the command line.
