(PECL runkit >= 0.7.0)
runkit_class_adopt — Convert a base class to an inherited class, add ancestral methods when appropriate
bool runkit_class_adopt ( string $classname , string $parentname )
classname
Name of class to be adopted
parentname
Parent class which child class is extending
 Returns TRUE on success or FALSE on failure. 
Example #1 A runkit_class_adopt() example
<?php
class myParent {
  function parentFunc() {
    echo "Parent Function Output\n";
  }
}
class myChild {
}
runkit_class_adopt('myChild','myParent');
myChild::parentFunc();
?> The above example will output:
Parent Function Output
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    https://secure.php.net/manual/en/function.runkit-class-adopt.php