Code Duplication    Length = 6-6 lines in 2 locations

src/tree/NamedNodeList.php 2 locations

@@ 58-63 (lines=6) @@
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        if ($value->parentNode != $this->parentNode) {
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            $value->parentNode = $this->parentNode;
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        }
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        if ($this->offsetExists( $name )) {
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            $old = $this->offsetGet( $name );
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            if ($old !== $value) {
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                $old->parentNode = null;
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            }
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        }
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        parent::offsetSet($name, $value);
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    }
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@@ 69-74 (lines=6) @@
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    public function offsetUnset($name)
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    {
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        if ($this->offsetExists( $name )) {
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            $node = $this->offsetGet( $name );
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            if ($node->parentNode) {
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                $node->parentNode = null;
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            }
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        }
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        parent::offsetUnset( $name );
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    }
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