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    <p>If <em>every class</em> should have the colors, define the interface that allows to get them:</p> <pre><code>interface ColorsProvider { function getColors(); } class FirstScheme implements ColorsProvider { public static COLORS = array('1' =&gt; 'green', '2' =&gt; 'red', ...); public function getColors() { return self::COLORS; } } class SecondScheme implements ColorsProvider { public static COLORS = array('1' =&gt; 'red', '2' =&gt; 'green', ...); public function getColors() { return self::COLORS; } } </code></pre> <p>Then, where you have stack of yout params:</p> <pre><code>$a = array( 'attr_value1' =&gt; new FirstScheme(), 'attr_value2' =&gt; new SecondScheme(), ); </code></pre> <p>You can call:</p> <pre><code>$param = 'attr_value1'; if(!isset($a[$param])) throw new Exception("undefined param"); if(!($a[$param] instanceof ColorsProvider)) throw new Exception("Param should point to ColorsProvider"); $a[$param]-&gt;getColors(); </code></pre> <hr> <p>Please note that it is full-objective. In PHP there are simplier ways to get this effects, but my solution is just elegant.</p> <hr> <p>The another point is the interface <em>completely separates the source</em> of colors. There would be from file, database, xml, hardcoded etc.</p> <hr> <p>Default implementation might be:</p> <pre><code>abstract class DefaultColorsProviderImpl implements ColorsProvider { protected static COLORS = array(); public function getColors() { return self::COLORS; } } class FirstScheme extends DefaultColorsProviderImpl { protected static COLORS = array( ... ); } </code></pre> <p>But still allows to make generic implementation that returns colors from e.x. from file.</p>
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    1. CO`getColors()` implementation might (must?) be moved to a parent abstract class. And color property doesn't need to be either public or static
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    2. COmight be, but this solution (using interfaces) allows you to get colors from any source, ot only hardcoded array (as i mentioned). The another way is make default implementation (`ColorsProviderArrayImpl`) that returns colors from array (and it is popular solution, what you have mentioned, but still based on interfaces that allows you to create completely different implementation).
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    3. COI still don't see any reason for code duplication (they still implement the same interface) or for leaving `$COLORS` property public and static (as long as you've decided to retrieve it using method, not directly)
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