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    <p>You're assuming here php executes top to bottom, but it doesn't quite work like that: </p> <pre><code>&lt;?php foo(); # works function foo(){ print "bar"; } </code></pre> <hr> <pre><code>&lt;?php foo(); #dies if( $i == 1 ) { function foo(){ print "bar"; } } </code></pre> <hr> <pre><code>&lt;?php $i = 1; if( $i == 1 ) { function foo(){ print "bar"; } } foo(); #works </code></pre> <hr> <p>Now, although you can conditionally create classes: </p> <pre><code>&lt;?php class A { } class B { } if( false ){ class C extends B { public static function bar(){ print "baz"; } } } C::bar(); # dies </code></pre> <p>You cant instantiate one at runtime from a variable: </p> <pre><code>&lt;?php class A { } class B { } $x = 'B'; if( false ){ class C extends $x { public static function bar(){ print "baz"; } } } C::bar(); ---&gt; Parse error: syntax error, unexpected T_VARIABLE, expecting T_STRING in /tmp/eg.php on line 7 </code></pre> <p>There is a way to do it with Eval, but you <em>really</em> don't want to go there: </p> <pre><code>&lt;?php class A { } class B { } $x = 'B'; if( true ){ $code =&lt;&lt;&lt;EOF class C extends $x { public static function bar(){ print "baz"; } } EOF; eval( $code ); } C::bar(); $o = new C; if ( $o instanceof $x ) { print "WIN!\n"; } ---&gt;barWIN! </code></pre> <p>However, there is a more important question here: </p> <p><strong>Why the hell would you <em>want</em> to extend a different class at runtime </strong> </p> <p>Anybody using your code will want to hold you down and <em>whip</em> you for that.</p> <p>( Alternatively, if you're into whipping, do that eval trick )</p>
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    1. USKent Fredric
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    1. COIn an ideal world people wouldn't want to do it. But it's not an ideal world. I looked this up because I'm stuck with Joomla changing the parent class for defining new "elements" between version 1.5.x and later versions. My subclass doesn't need to be different and I don't want different code bases, so I want to be able to inherit from different classes according to the version of Joomla. That's why.
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      1. USuser185631
    2. COIt seems as though Generics not possible with PHP, disappointing, I thought of hacking it this way!
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      1. USZiyan Junaideen
    3. CO@user185631 Came here for the exact same reason.
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      1. USmavrosxristoforos
 

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