How to create a tree of category subcatagory in php -


i trying create tree ordered select box array of category, subcategory data. array

array (     [0] => array         (             [id] => 6             [cata_key] => 32e9c75e38d2a1d77b2b49b2             [cata_name] => road             [app_key] => b80e0935b348da61b2a807ff             [parentid] => 0         )  [1] => array     (         [id] => 7         [cata_key] => 56bae4297efcbf796b230a99         [cata_name] => river         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 0     )  [2] => array     (         [id] => 8         [cata_key] => 1c748603f36105b921b54165         [cata_name] => air         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 0     )  [3] => array     (         [id] => 9         [cata_key] => 780c3eb53264d5c33a26d49f         [cata_name] => cars         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 6     )  [4] => array     (         [id] => 10         [cata_key] => 111cd06b1575457f665d460e         [cata_name] => hyundai         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 9     )  [5] => array     (         [id] => 11         [cata_key] => 26ca0e1622c11ed2628eaadf         [cata_name] => maruthi         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 9     )  [6] => array     (         [id] => 12         [cata_key] => 7fc72e49fe67d0b777648f54         [cata_name] => boat         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 7     )  [7] => array     (         [id] => 13         [cata_key] => b6125c73f6d7c153f45e133e         [cata_name] => ship         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 7     )  [8] => array     (         [id] => 14         [cata_key] => 38c749056a9f583e284e509b         [cata_name] => 2 seater         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 12     )  [9] => array     (         [id] => 15         [cata_key] => 6ebfcad4d4e05e84d333b7e5         [cata_name] => 10 seater         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 12     )  [10] => array     (         [id] => 16         [cata_key] => 49973084640af71ad61e634b         [cata_name] => bikes         [app_key] => b80e0935b348da61b2a807ff         [parentid] => 6     ) )

in parentid points parent category. resultant array should in order of

road ->cars     -> hyndai     -> maruthi -> bikes river -> boats     -> 2 seater     -> 10 seater -> ship air 

<?php $categories = array(     array('id' => 1,  'parent' => 0, 'cata_name' => 'road'),     array('id' => 2,  'parent' => 1, 'name' => 'cars'),     array('id' => 3,  'parent' =>2, 'name' => 'maruthi'),     array('id' => 4,  'parent' => 2, 'name' => 'hyundai') );  function categoriestotree(&$categories) {      $map = array(         0 => array('subcategories' => array())     );      foreach ($categories &$category) {         $category['subcategories'] = array();         $map[$category['id']] = &$category;     }      foreach ($categories &$category) {         $map[$category['parent']]['subcategories'][] = &$category;     }      return $map[0]['subcategories'];  }    $tree = categoriestotree($categories);    echo "=== tree ===\n"; echo "<pre>"; print_r ($tree); ?>

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