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POOverload the behavior of count() when called on certain objects
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/5289705/count-elements-for-objects-implementing-arrayaccess-using-count">Count elements for objects implementing ArrayAccess using count()?</a> </p> </blockquote> <p>In PHP 5, you can use magic methods, overload some classes, etc. In C++, you can implement functions that exist as long as the argument types are different. Is there a way to do this in PHP?</p> <p>An example of what I'd like to do is this:</p> <pre><code>class a { function a() { $this-&gt;list = array("1", "2"); } } $blah = new a(); count($blah); </code></pre> <p>I would like blah to return 2. IE count the values of a specific array in the class. So in C++, the way I would do this might look like this:</p> <pre><code>int count(a varName) { return count(varName-&gt;list); } </code></pre> <p>Basically, I am trying to simplify data calls for a large application so I can call do this:</p> <pre><code>count($object); </code></pre> <p>rather than</p> <pre><code>count($object-&gt;list); </code></pre> <p>The list is going to be potentially a list of objects so depending on how it's used, it could be really nasty statement if someone has to do it the current way:</p> <pre><code>count($object-&gt;list[0]-&gt;list[0]-&gt;list); </code></pre> <p>So, can I make something similar to this:</p> <pre><code>function count(a $object) { count($object-&gt;list); } </code></pre> <p>I know PHP's count accepts a mixed var, so I don't know if I can override an individual type.</p>
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    1. CONote: You can't overload STL functions...
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    2. COIt tells you the answer on the [count docs page](http://php.net/manual/en/function.count.php). "For objects, if you have SPL installed, you can hook into count() by implementing interface Countable. The interface has exactly one method, Countable::count(), which returns the return value for the count() function."
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