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<?php $reasons = [ "1" => [ "101" => "reason1", "102" => "reason2", ], "2" => [ "201" => "reason3", "202" => "reason4", ], ]; $newReasons = array_reduce($reasons, function ($list, $item) { // 配列のキーを維持するため + で結合 return $list + $item; }, []); var_dump($newReasons);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.26, 8.2.0 - 8.2.13, 8.3.0
array(4) { [101]=> string(7) "reason1" [102]=> string(7) "reason2" [201]=> string(7) "reason3" [202]=> string(7) "reason4" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/RGPH7 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/RGPH7 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/RGPH7 on line 3
Process exited with code 255.

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