How can the use of trim() affect the functionality of PHP code when dealing with strings containing spaces?

Using trim() on a string containing spaces can remove leading and trailing spaces, which can be helpful in scenarios where extra spaces may cause issues with comparisons or formatting. By using trim(), you ensure that the string is clean and does not have any unnecessary spaces at the beginning or end.

$string = "   Hello, World!   ";
$trimmedString = trim($string);

echo $trimmedString; // Output: "Hello, World!"