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<?php $itemList = array( array("id" => 100,"categorypath" => "level1/powders", "product" => "Mens powder"), array("id" => 200,"categorypath" => "level1/oils/sunflower", "product" => "XYZ oil"), array("id" => 300,"categorypath" => "level1/eatable/vegetables", "product" => "carrot"), array("id" => 400,"categorypath" => "level1/oils/sunflower", "product" => "ABC oil"), array("id" => 500,"categorypath" => "level1/eatable/fruits", "product" => "mango"), array("id" => 600,"categorypath" => "level1/eatable/vegetables", "product" => "spinach"), array("id" => 700,"categorypath" => "level2/baby items/toys", "product" => "puzzle block"), array("id" => 800,"categorypath" => "level2/baby items/toys", "product" => "trucks and cars"), array("id" => 900,"categorypath" => "level2/baby items/clothes", "product" => "shirts"), array("id" => 1000,"categorypath" => "level1/powders", "product" => "Womens powder"), array("id" => 1100,"categorypath" => "level1/oils/groundnut", "product" => "GN oil"), ); // First, group products into their categories. $categoryList = []; foreach ($itemList as $item){ $categoryList[$item['categorypath']][] = [ 'id' => $item['id'] , 'path' => $item['categorypath'] , 'prodname' => $item['product'] ]; } // Now, create a tree structure out of the categories $jsonTree = ['category'=>[]]; $lookupTable = []; foreach ($categoryList as $category=>$productList){ $componentList = explode('/', $category); $path = ''; $parent = &$jsonTree; do { $component = array_shift($componentList); $path .= $component.'/'; $entry = &$lookupTable[$path]; if (!$entry){ $entry = [ 'categoryName' => $component ]; $parent['category'][] = &$entry; } $parent = &$entry; } while ($componentList); $entry['products'] = $productList; } echo json_encode($jsonTree, JSON_PRETTY_PRINT);

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Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
{ "category": [ { "categoryName": "level1", "category": [ { "categoryName": "powders", "products": [ { "id": 100, "path": "level1\/powders", "prodname": "Mens powder" }, { "id": 1000, "path": "level1\/powders", "prodname": "Womens powder" } ] }, { "categoryName": "oils", "category": [ { "categoryName": "sunflower", "products": [ { "id": 200, "path": "level1\/oils\/sunflower", "prodname": "XYZ oil" }, { "id": 400, "path": "level1\/oils\/sunflower", "prodname": "ABC oil" } ] }, { "categoryName": "groundnut", "products": [ { "id": 1100, "path": "level1\/oils\/groundnut", "prodname": "GN oil" } ] } ] }, { "categoryName": "eatable", "category": [ { "categoryName": "vegetables", "products": [ { "id": 300, "path": "level1\/eatable\/vegetables", "prodname": "carrot" }, { "id": 600, "path": "level1\/eatable\/vegetables", "prodname": "spinach" } ] }, { "categoryName": "fruits", "products": [ { "id": 500, "path": "level1\/eatable\/fruits", "prodname": "mango" } ] } ] } ] }, { "categoryName": "level2", "category": [ { "categoryName": "baby items", "category": [ { "categoryName": "toys", "products": [ { "id": 700, "path": "level2\/baby items\/toys", "prodname": "puzzle block" }, { "id": 800, "path": "level2\/baby items\/toys", "prodname": "trucks and cars" } ] }, { "categoryName": "clothes", "products": [ { "id": 900, "path": "level2\/baby items\/clothes", "prodname": "shirts" } ] } ] } ] } ] }
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