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<?php $arr = [ ['A', 1], 'B', ['C', 2], 'D', 'E', ['F', 3], ]; print json_encode(array_column($arr, null, 1), JSON_PRETTY_PRINT);
Output for git.master, git.master_jit, rfc.property-hooks
{ "1": [ "A", 1 ], "2": [ "C", 2 ], "3": [ "F", 3 ], "4": "E" }

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