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<?php $users = [ ['name' => 'Bronn', 'gender' => 'male', 'birthday' => '1973-03-23'], ['name' => 'Reigar', 'gender' => 'male', 'birthday' => '1973-11-03'], ['name' => 'Eiegon', 'gender' => 'male', 'birthday' => '1963-11-03'], ['name' => 'Sansa', 'gender' => 'female', 'birthday' => '2012-11-03'], ['name' => 'Jon', 'gender' => 'male', 'birthday' => '1980-11-03'], ['name' => 'Robb','gender' => 'male', 'birthday' => '1980-05-14'], ['name' => 'Tisha', 'gender' => 'female', 'birthday' => '2012-11-03'], ['name' => 'Rick', 'gender' => 'male', 'birthday' => '2012-11-03'], ['name' => 'Joffrey', 'gender' => 'male', 'birthday' => '1999-11-03'], ['name' => 'Edd', 'gender' => 'male', 'birthday' => '1973-11-03'] ]; $filter = array_filter($users, fn($us) => $us['gender'] === 'male'); $map = array_map(fn($us) => $us['birthday'], $filter); $val = array_keys($map); var_dump($val);