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<?php $cars = [ [ 'icon' => 'sim', 'example' => 'also_duplicate', ], [ 'icon' => 'airtime', 'example' => 'also_duplicate', ], [ 'icon' => 'sim', 'example' => 'also_duplicate', ], ]; echo json_encode(array_intersect_key($cars, array_unique(array_column($cars, 'icon'))));
Output for git.master, git.master_jit, rfc.property-hooks
[{"icon":"sim","example":"also_duplicate"},{"icon":"airtime","example":"also_duplicate"}]

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