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<?php $old = array( 20 => array( 'name' => 'Heels', 'path' => '10/15/20', ), 15 => array( 'name' => 'Sandals', 'path' => '15', ), 10 => array( 'name' => 'Trainers', 'path' => '10', ), ); $result = []; $mapper = array_combine(array_keys($old), array_column($old, 'name')); foreach ($old as $key => $value) { $path = implode(' > ', array_map(function($x) use ($mapper) { return $mapper[(int)$x]; }, explode('/', $value['path']))); $result[$key] = ['value' => $key,'label' => $path]; } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [20] => Array ( [value] => 20 [label] => Trainers > Sandals > Heels ) [15] => Array ( [value] => 15 [label] => Sandals ) [10] => Array ( [value] => 10 [label] => Trainers ) )

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