How can developers ensure the security of their PHP applications when using $_REQUEST?

Developers can ensure the security of their PHP applications when using $_REQUEST by validating and sanitizing the input data. This can help prevent common security vulnerabilities such as SQL injection and cross-site scripting attacks. It is also recommended to use specific superglobals like $_GET or $_POST instead of $_REQUEST to only allow certain types of input. 

// Example of validating and sanitizing input from $_POST
$username = isset($_POST['username']) ? htmlspecialchars($_POST['username']) : '';
$password = isset($_POST['password']) ? htmlspecialchars($_POST['password']) : '';

Keywords

$_REQUEST security PHP applications input validation cross-site scripting

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