PHP Codeigniter: Convert multidimensional array to single dimensional array : I have a multidimensional array like below

    Array
    (
        [0] => Array
              (
                [0] => manoj
                [1] => karthi
              )
       [1] => Array
              (
                [0] => kumar
              )
    )

I want to merge two array like this

    Array
    (
       [0] => manoj
       [1] => karthi
       [2] => kumar
    )
    
    
    


