PHP Multiple Inheritance

A.php

<?php

class A {
   function x() { echo 'Ich bin Klasse A'; }
}

B.php

<?php

class B {
   function y() { echo 'Ich bin Klasse B'; }
}

C.php

<?php
class C extends A, B {
   // Blubb
}

index.php

<?php

function __autoload($class_name) {
   if (!file_exists($class_name . '.php')) return;
   $file = file_get_contents($class_name . '.php');
   $file = substr($file, 5);
   preg_match_all('/class [[:alnum:]]+ extends [[:alnum:], ]+/i', $file, $classes, PREG_OFFSET_CAPTURE);
   if (count($classes[0]) == 0) {
      $file2 = $file;
   } else {
      $file2 = '';
      $lastPos = 0;
      foreach ($classes as $class) {
         if (!is_array($class) || count($class) == 0) continue;
         $class = $class[0];
         $file2 .= substr($file, $lastPos, $class[1]);
         $lastPos = $class[1] + strlen($class[0]);
         $file2 .= substr($class[0], 0, strpos($class[0], ' extends')) . ' {';
         $extends = substr($class[0], strpos($class[0], ' extends') + 8);
         $extends = explode(',', $extends);
         foreach ($extends as $extend) {
            $extend = trim($extend);
            if (strlen($extend) < 1) continue;
            if (!class_exists($extend)) {
               __autoload($extend);
            }
            $includeFile = file_get_contents($extend . '.php');
            $includeFile = substr($includeFile, strpos($includeFile, '{') + 1);
            $includeFile = substr($includeFile, 0, strrpos($includeFile, '}'));
            $file2 .= $includeFile;
         }
         $file2 .= substr($file, $class[1] + strlen($class[0]) + 1);
      }
   }
   eval($file2);
}

$c = new C();
$c->x();
$c->y();

Multiple inheritance is bad and you should feel bad :)