If you want to trim and print one dimensional Array or the deepest dimension of multi-dimensional Array you should use:
foreach($array as $key => $value)
{
$array[$key] = trim($value);
print("-");
print($array[$key]);
print("-");
print("<br>");
}
If you want to trim but do not want to print one dimensional Array or the deepest dimension of multi-dimensional Array you should use:
$array = array_map('trim', $array);