PHP trim() removes whitespace from the beginning and end of a string. It does not remove spaces during a string. The usage of trim() is very simple.

This example shows trim() best

$new_string = "     The horse has bolted.  ";
echo "|$new_string|";
echo "<br>";
echo "|".trim($new_string)."|";

| The horse has bolted. |
|The horse has bolted.|

Note that the spaces in between words still exists with the use of trim().