如何在PHP中實現Countable接口？

Question

這樣count($object)將在返回的記錄數它

Answer 1

看看Countable::count

class MyClass implements Countable { 
    public function count() { 
     //return count 
    } 
} 

$c = new MyClass(); 
count($c); //calls $c->count(); 

Answer 2

如果您有標準PHP庫安裝，你應該能夠簡單地實現你的類可數，然後定義count（）函數：

class foo implements Countable { 
    ... 
    public function count() { 
     # do stuff here 
     return $count; 
    } 
} 

瞭解更多關於這裏的SPL： http://www.php.net/manual/en/book.spl.php

更多關於可數的接口在這裏： http://php.net/manual/en/countable.count.php