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<?php $arr = [1 => "As", 3 => "asdf"]; $aras = array_fill_keys([2,4,5], array()); $asrr = [2 => [], 3 => "ASdasfas"]; print_r($arr + $asrr); print_r($aras);
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.16 - 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 ( [1] => As [3] => asdf [2] => Array ( ) ) Array ( [2] => Array ( ) [4] => Array ( ) [5] => Array ( ) )
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] => As [3] => asdf [2] => Array ( ) ) Array ( [2] => Array ( ) [4] => Array ( ) [5] => Array ( ) )

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