Interfaces
Note that arrays don't implement countable. Therefore you can't force a countable parameter for a function if you want it also to work with native arrays.
El interfaz Countable
Introducción
Las clases implementado Countable pueden ser usadas con la función count().
Interfaz synopsis
Table of Contents
- Countable::count — Cuenta los elementos de un objeto
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User Contributed Notes
Countable
Anonymous
17-Jan-2011 02:10
isaac dot z dot foster dot nada at spamporfav dot gmail dot com
08-Jun-2010 08:18
I just want to point out that your class has to actually implement the Countable interface, not just define a count method, to be able to use count($object) and get the expected results. I.e. the first example below won't work as expected, the second will. (The normal arrow function accessor ($object->count()) will work fine, but that's not the kewl part :) )
<?php
//Example One, BAD :(
class CountMe
{
protected $_myCount = 3;
public function count()
{
return $this->_myCount;
}
}
$countable = new CountMe();
echo count($countable); //result is "1", not as expected
//Example Two, GOOD :)
class CountMe implements Countable
{
protected $_myCount = 3;
public function count()
{
return $this->_myCount;
}
}
$countable = new CountMe();
echo count($countable); //result is "3" as expected
?>