Remove whitespaces from both sides of a string in PHP

Description

The following code shows how to remove whitespaces from both sides of a string.

Example

// w ww. j  a  va 2s  .co m
<?php
    $str = " Hello World! ";
    echo "Without trim: " . $str;
    echo "<br>";
    echo "With trim: " . trim($str);
?>

The code above generates the following result.