Trim Function Coding

Coding:

<?PHP

//$space = "creatersite";
$space = trim(" hello ");//trim() is to remove space
$letCount = strlen($space);
print $letCount;

?>

In this Coding why we have to use trim function to remove the space between the letters

and characters 
$space = trim(" hello ");

We didn't use the trim function we can see that there is extra space before and after 
the text take and count the length.$space = "creatersite";

Try this script