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<?php $arr1 = [ "A" => "dataA1", "B" => "dataB1", "C" => "dataC1"]; $arr2 = [ "A" => "dataA2", "C" => "dataC2", "D" => "dataD2"]; $out = array_reduce( array_unique(array_merge(array_keys($arr1), array_keys($arr2))), function($c, $k) use($arr1, $arr2) { $c[$k] = array_merge( [$arr1[$k] ?? null], [$arr2[$k] ?? null], ); return $c; }, [] ); var_dump($out);
Output for 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 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(4) { ["A"]=> array(2) { [0]=> string(6) "dataA1" [1]=> string(6) "dataA2" } ["B"]=> array(2) { [0]=> string(6) "dataB1" [1]=> NULL } ["C"]=> array(2) { [0]=> string(6) "dataC1" [1]=> string(6) "dataC2" } ["D"]=> array(2) { [0]=> NULL [1]=> string(6) "dataD2" } }
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(4) { ["A"]=> array(2) { [0]=> string(6) "dataA1" [1]=> string(6) "dataA2" } ["B"]=> array(2) { [0]=> string(6) "dataB1" [1]=> NULL } ["C"]=> array(2) { [0]=> string(6) "dataC1" [1]=> string(6) "dataC2" } ["D"]=> array(2) { [0]=> NULL [1]=> string(6) "dataD2" } }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Parse error: syntax error, unexpected ')' in /in/cg86V on line 11
Process exited with code 255.

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