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<?php $arry = []; $arry["name"] = ["val", "val@"]; $arry["nome"] = ["shut", "shit"]; var_dump(array_merge($arry, ["shit"]));
Output for 7.3.0 - 7.3.28, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
array(3) { ["name"]=> array(2) { [0]=> string(3) "val" [1]=> string(4) "val@" } ["nome"]=> array(2) { [0]=> string(4) "shut" [1]=> string(4) "shit" } [0]=> string(4) "shit" }