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<?php $temp = [ ['child_id' => 14, 'id' => 15], ['child_id' => 16, 'id' => 14], ['child_id' => 17, 'id' => 18], ['child_id' => 1, 'id' => 0], ['child_id' => 2, 'id' => 0], ['child_id' => 3, 'id' => 0], ['child_id' => 11, 'id' => 3], ['child_id' => 12, 'id' => 3], ['child_id' => 13, 'id' => 11], ]; function buildTree(array &$elements, $parentId = 0) { sort(array_unique(array_column($elements, 'id'))); print_r($elements); } print_r(buildTree($temp));
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