PHP OOP Question

Question

How to implement a similar design?

class LogBase { function __construct() {} public function write($message) { fwrite(self::$file, "bla-bla"); } } class Log extends LogBase { private $file = 'address/to/file'; }

(abbreviated).
That is, I wanted to implement all the functionality in the parent (but not used class), but because I need several different logs, create descendant classes, which will be given the path to the log. But if you use

 Log::write('something');

then self::$file in this case leads to the parent class, in which this variable, of course, does not.

Ilya Pirogov Ilya Pirogov 10.4k one 14 25 · Accepted Answer · 2012-04-21T17:57:13

Late Static Bindings

As of PHP 5.3.0, it is a php.

 class A { public static function who() { echo __CLASS__; } public static function test() { static::who(); // Here comes Late Static Bindings } } class B extends A { public static function who() { echo __CLASS__; } } B::test();

Alex Kapustin Alex Kapustin 11.1k 12 nineteen · Answer 2 · 2012-04-21T17:47:34

 class LogBase { protected static $fHandle = false; protected function openFile() { if (self::$fHandle !== false) return true; self::$fHandle = fopen(static::FILE, 'a'); return true; } public static function write($message) { self::openFile(); fwrite(self::$fHandle, $message."\n"); } } class Log extends LogBase { const FILE = 'address_to_file';. } Log::write("sd");

Will work only with 5.3

What you want is called "later static binding"

Thank you very much everyone, I did not know about such a thing.

Answer 3 · 2012-04-21T17:29:58

Try this:

 class LogBase { protected $file; // эта переменная будет доступной в наследниках и в данном классе function __construct($log_file) {$file = $log_file;} public function write($message) { fwrite($file, "bla-bla"); } } class Log extends LogBase { // данный объект можно конструировать, используя родительский конструктор ... } $log = new Log('address/to/file'); // К примеру $log->write("что-то записывается в файл...");

That's just the point, I need non-instantiated classes (that is, not objects), so you cannot use the constructor.
I need several logs (they have different files), but the functionality is the same.
Namely, I need classes (not objects) for visibility everywhere in the application.

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