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POPHP: Limiting static variable scope to specific class
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  1. POPHP: Limiting static variable scope to specific class
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    copied!<pre><code>abstract class Mother { protected static $foo = null; protected static $bar = null; public function getFoo() { return static::$foo; } public function getBar() { return static::$bar; } public function setFoo($foo) { static::$foo = $foo; } public function setBar($bar) { static::$bar = $bar; } } class Brother extends Mother { protected static $foo = 'BROTHERS'; } class Sister extends Mother { protected static $foo = 'SISTERS'; } $brother1 = new Brother(); $brother2 = new Brother(); $sister1 = new Sister(); $sister2 = new Sister(); $sister1-&gt;setBar('ONLY SISTERS'); // We set $bar = 'ONLY SISTERS' at sister1. // We want only Sister instances to get this value... // however Brother instances also get this value! echo '&lt;p&gt;Brother 1: Foo="'.$brother1-&gt;getFoo().'", Bar="'.$brother1-&gt;getBar().'"&lt;/p&gt;'; // Foo="BROTHERS", Bar="ONLY SISTERS" echo '&lt;p&gt;Brother 2: Foo="'.$brother2-&gt;getFoo().'", Bar="'.$brother2-&gt;getBar().'"&lt;/p&gt;'; // Foo="BROTHERS", Bar="ONLY SISTERS" echo '&lt;p&gt;Sister 1: Foo="'.$sister1-&gt;getFoo().'", Bar="'.$sister1-&gt;getBar().'"&lt;/p&gt;'; // Foo="SISTERS", Bar="ONLY SISTERS" echo '&lt;p&gt;Sister 2: Foo="'.$sister2-&gt;getFoo().'", Bar="'.$sister2-&gt;getBar().'"&lt;/p&gt;'; // Foo="SISTERS", Bar="ONLY SISTERS" </code></pre> <p>So apparently if static::$bar is not explicitly redefined in every child (Brother, Sister) their parent (Mother) will set the value for them (or at least for those who did not redefine it).</p> <p><strong>The question</strong>: Is there any way to prevent children who did not redefine static::$bar from receiving the new value? In other words, how to make sure only the referred class gets a new value, EVEN if static::$bar is not explicitly redefined in every child?</p>
 

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