Remove white space in the array elements with trim not works

I have this array:

array:4 [▼
  0 => "juego de tronos"
  1 => "tagaryen"
  2 => "house targaryen"
  3 => "casa targaryen"
]

and I want get this result:

array:4 [▼
  0 => "juegodetronos"
  1 => "tagaryen"
  2 => "housetargaryen"
  3 => "casatargaryen"
]

I´m using this function but not works: array_map('trim',$myarray)

via Chebli Mohamed