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html - How to show tree view in php? - Stack Overflow
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php - Building a tree view - Stack Overflow
how to create dynamic tree view in php - Phpflow.com
PHPでツリー構造のデータを構築する #PHP - Qiita
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PHP TreeView Demo - Overview
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Create Treeview with jsTree plugin and PHP - Makitweb
Dynamic Treeview Menu using PHP, MySQL and AJAX Example