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<?php $array = [ 'a' => ['a' => 'asd'], 'b' => ['b' => 'bsd'], 'c' => ['c' => 'csd'], ]; foreach ($array as &$item) { unset($item['a']); } var_dump($array);
Output for 7.1.0 - 7.1.20, 7.2.0 - 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
array(3) { ["a"]=> array(0) { } ["b"]=> array(1) { ["b"]=> string(3) "bsd" } ["c"]=> &array(1) { ["c"]=> string(3) "csd" } }
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(3) { ["a"]=> array(0) { } ["b"]=> array(1) { ["b"]=> string(3) "bsd" } ["c"]=> &array(1) { ["c"]=> string(3) "csd" } }

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