Online PHP editor | refs for oGE8S

<?php class SomethingBuilder { private $name; private $super; function __construct($name){ $this->name = $name; } function setSuper($super){ $this->super = $super; } function getSuper(){ return $this->super; } function copy($whatToCopy = null, $copyOfwhatToCopy = null){ if($this !== $whatToCopy){ $copy = new SomethingBuilder($this->name); if($this->super){ $copy->setSuper($this->super->copy( $whatToCopy ?? $this, $copyOfwhatToCopy ?? $copy )); } return $copy; }else{ return $copyOfwhatToCopy; } } } echo "No circular dependency:\n"; $a = new SomethingBuilder("A"); $b = new SomethingBuilder("B"); $a->setSuper($b); echo "ORIGINAL:\n"; var_dump($a); echo "COPY:\n"; var_dump($a->copy()); echo "\n----------\n\n"; echo "Self circular dependency:\n"; $a = new SomethingBuilder("A"); $a->setSuper($a); echo "ORIGINAL:\n"; var_dump($a); echo "COPY:\n"; var_dump($a->copy()); echo "\n----------\n\n"; echo "Two items circular dependency:\n"; $a = new SomethingBuilder("A"); $b = new SomethingBuilder("B"); $b->setSuper($a); $a->setSuper($b); echo "ORIGINAL:\n"; var_dump($a); echo "COPY:\n"; var_dump($a->copy()); echo "\n----------\n\n"; echo "Three items circular dependency:\n"; $a = new SomethingBuilder("A"); $b = new SomethingBuilder("B"); $c = new SomethingBuilder("C"); $a->setSuper($c); $b->setSuper($a); $c->setSuper($b); echo "ORIGINAL:\n"; var_dump($a); echo "COPY:\n"; var_dump($a->copy());