Trees

RedBeanPHP also supports self-referential one-to-many and many-to-many relationships. In RedBeanPHP terminology these are called trees. Here is an example, let's decorate a christmas tree with some candy canes:

    $cane = R::dispense('cane',10);
    $cane[1]->ownCane = array( $cane[2], $cane[9] );
    $cane[2]->ownCane = array( $cane[3], $cane[4] );
    $cane[4]->ownCane = array( $cane[5], 
                $cane[7], $cane[8] );
    $cane[5]->ownCane = array( $cane[6] );
    $id = R::store($cane[1]);
    $root = R::load('cane',$id);
    echo $root->ownCane[2]->ownCane[4]
        ->ownCane[5]->ownCane[6]->id;
    //outputs: 6

In fact trees are just a special case of lists.

In other words…

A Tree is the RedBeanPHP version of a self-referential relationship.

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