Почему не работет запись в файл?

Question

[Bugi_Bugi]

class DZ {
	public $file_DZ;
	public function __construct($file) {
		$this->$file = $file;
		$file_DZ = fopen($file, 'a');
	}
	public function WriteFile($text) {
		fwrite($this->$file_DZ, $text . PHP_EOL);
	}
	public function __destruct() {
		fclose($this->$file_DZ);
	}
}

error_reporting(-1);
	require_once 'DZ.php';
	$file = new DZ('DZ.txt');
	$file->WriteFile('Строка 1');

Comments

[alexalexes]

Смотрели файл error_log?

[Bugi_Bugi]

alexalexes,
Notice: Undefined variable: file_DZ in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 14
Notice: Undefined property: DZ::$ in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 14
Warning: fwrite() expects parameter 1 to be resource, null given in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 14
Notice: Undefined variable: file_DZ in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 18
Notice: Undefined property: DZ::$ in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 18\
Warning: fclose() expects parameter 1 to be resource, null given in C:\xampp\htdocs\Practic_PHP.local\OOP\DZ.php on line 18

Answer 1

[nokimaro]

вместо $this->$file надо $this->file

$this->file
$this->file_DZ

Answer 2

[Андрей Рабой]

попробуй
class DZ {
public $file_DZ;
public function __construct($file) {
$this->file_DZ = fopen($file, 'a');
}
public function WriteFile($text) {
fwrite($this->file_DZ, $text . PHP_EOL);
}
public function __destruct() {
fclose($this->file_DZ);
}
}