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    <p>If your class is not meant to define some super-type, it should not be declared as <strong><code>abstract</code></strong>, I'd say.</p> <p>In your case, I would rather go with a class :</p> <ul> <li>That defines <strong><code>__construct</code></strong> and <strong><code>__clone</code></strong> as private methods <ul> <li>so the class cannot be instanciated from outside</li> </ul></li> <li>And, this way, your class could create an instance of itself <ul> <li>See the <strong><a href="http://en.wikipedia.org/wiki/Singleton_pattern" rel="noreferrer">Singleton design pattern</a></strong>, about that, btw</li> </ul></li> </ul> <p><br> Now, why use a Singleton, and not only static methods ? I suppose that, at least a couple of reasons can be valid :</p> <ul> <li>Using a singleton means using an instance of the class ; makes it easier to transform a non-singleton class to a singleton one : only have to make <code>__construct</code> and <code>__clone</code> private, and add some <code>getInstance</code> method.</li> <li>Using a singleton also means you have access to everything you can use with a normal instance : <code>$this</code>, properties, ...</li> <li>Oh, a third one <em>(not sure about that, but might have its importance)</em> : with PHP &lt; 5.3, you have less possibilities with static methods/data : <ul> <li><a href="http://fr2.php.net/__call" rel="noreferrer"><strong><code>__callStatic</code></strong></a> has only been introduced in PHP 5.3</li> <li>There is no <code>__getStatic</code>, <code>__setStatic</code>, ...</li> <li>Same for a couple of other <a href="http://fr2.php.net/manual/en/language.oop5.magic.php" rel="noreferrer"><strong>Magic methods</strong></a> !</li> </ul></li> <li><a href="http://fr2.php.net/manual/en/language.oop5.late-static-bindings.php" rel="noreferrer">Late Static Binding</a> has only been added with PHP 5.3 ; and not having it often makes it harder, when working with static methods/classes ; especially when using inheritance.</li> </ul> <p><br> This being said, yes, some code like this :</p> <pre><code>abstract class MyClass { protected static $data; public static function setA($a) { self::$data['a'] = $a; } public static function getA() { return self::$data['a']; } } MyClass::setA(20); var_dump(MyClass::getA()); </code></pre> <p>Will work... But it doesn't feel quite natural... and this is a very simple example <em>(see what I said earlier with Late Static Binding, and magic methods)</em>.</p>
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    1. USPascal MARTIN
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    1. COSo, it's merely a style thing?
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