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<?php $details = ["Dog" => "Natahlia", "Cat" => "Ryan", "Bird" => "Natahlia"]; foreach(array_unique($details) as $name){ $new[$name] = array_keys(array_intersect($details, [$name])); } var_dump($new);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(2) { ["Natahlia"]=> array(2) { [0]=> string(3) "Dog" [1]=> string(4) "Bird" } ["Ryan"]=> array(1) { [0]=> string(3) "Cat" } }
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(2) { ["Natahlia"]=> array(2) { [0]=> string(3) "Dog" [1]=> string(4) "Bird" } ["Ryan"]=> array(1) { [0]=> string(3) "Cat" } }

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