string(26) "ARROYO SALA MARTÍN MUÑOZ"
<br> explode() <br>Array
(
    [0] => ARROYO
    [1] => SALA
    [2] => MARTÍN
    [3] => MUÑOZ
)
<br> implode() <br>string(29) "ARROYO, SALA, MARTÍN, MUÑOZ"