What potential issue is highlighted regarding the use of global variables in PHP?

The potential issue with using global variables in PHP is that they can lead to variable scope conflicts and make the code harder to debug and maintain. To solve this issue, it's recommended to use PHP's superglobal arrays like $_SESSION, $_GET, $_POST, or $_COOKIE to store and access global variables in a more organized and secure way. 

// Using superglobal arrays instead of global variables
$_SESSION['username'] = 'JohnDoe';
echo $_SESSION['username'];

Keywords

global variables variable scope namespace collision code maintainability security vulnerability

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