How can the use of register_globals in PHP code impact the functionality and security of a web application?

Using register_globals in PHP code can impact the functionality and security of a web application by making it vulnerable to security risks such as injection attacks and variable overwriting. It can also lead to unexpected behavior and make the code harder to maintain. To address this issue, it is recommended to disable register_globals in the PHP configuration and use superglobal arrays like $_GET, $_POST, and $_SESSION to access variables. 

// Disable register_globals in php.ini
// Use superglobal arrays instead
$variable = $_POST['variable'];

Keywords

register_globals PHP code functionality security web application

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