Remove whitespaces from the right side of a string in PHP

Description

The following code shows how to remove whitespaces from the right side of a string.

Example

/* ww  w. j a  v  a 2 s . c om*/
<?php
    $str = "Hello World!    ";
    echo "Without rtrim: " . $str;
    echo "<br>";
    echo "With rtrim: " . rtrim($str);
?>

The code above generates the following result.