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<?php $arrays = [ [ "id" => 1, "order_id" => 1, "image_url" => "/resources/filename1" ], [ "id" => 2, "order_id" => 1, "image_url" => "/resources/filename2" ], [ "id" => 3, "order_id" => 1, "image_url" => "/resources/filename3" ], [ "id" => 4, "order_id" => 2, "image_url" => "/resources/filename4" ], ]; foreach($arrays as $array) { if(!isset($result[$array['order_id']]['id'])) { $result[$array['order_id']]['id']=$array['id']; } $result[$array['order_id']]['order_id']=$array['order_id']; $result[$array['order_id']]['image_url'][]=$array['image_url']; } print_r($result);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
Array ( [1] => Array ( [id] => 1 [order_id] => 1 [image_url] => Array ( [0] => /resources/filename1 [1] => /resources/filename2 [2] => /resources/filename3 ) ) [2] => Array ( [id] => 4 [order_id] => 2 [image_url] => Array ( [0] => /resources/filename4 ) ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [1] => Array ( [id] => 1 [order_id] => 1 [image_url] => Array ( [0] => /resources/filename1 [1] => /resources/filename2 [2] => /resources/filename3 ) ) [2] => Array ( [id] => 4 [order_id] => 2 [image_url] => Array ( [0] => /resources/filename4 ) ) )

preferences:
117.88 ms | 403 KiB | 194 Q