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<?php $arrays = [ [ "id" => 1, "order_id" => 1, "image_url" => "/resources/filename1" ], [ "id" => 2, "order_id" => 1, "image_url" => "/resources/filename2" ] ]; $start = array_shift($arrays); $start['image_url'] = [$start['image_url']]; var_dump($start); $arrays = array_reduce($arrays, function($carry, $item) { $carry['image_url'][] = $item['image_url']; return $carry; }, $start); print_r($arrays);
Output for git.master_jit, git.master, rfc.property-hooks
array(3) { ["id"]=> int(1) ["order_id"]=> int(1) ["image_url"]=> array(1) { [0]=> string(20) "/resources/filename1" } } Array ( [id] => 1 [order_id] => 1 [image_url] => Array ( [0] => /resources/filename1 [1] => /resources/filename2 ) )

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