array_keys:返回数组中符合条件的键,组成为一个新的数组
复制 $array = [ 'a' => 'abc', 'aa' => 'abc', 'aaa' => 'abc', 'b' => 'bbc', 'c' => 'cbc', 'd' => 123, 1 =>...
复制 $array = [ 'a' => 'abc', 'aa' => 'abc', 'aaa' => 'abc', 'b' => 'bbc', 'c' => 'cbc', 'd' => 123, 1 =>...