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<?php $s =[ [ "id" => 1, "datas" => ['a','b','c'], ], [ "id" => 2, "datas" => ['d','e','f'], ], [ "id" => 3, "datas" => ['g','h','i'], ], ]; print_r(array_merge(...array_column($s, 'datas')));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f [6] => g [7] => h [8] => i )

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