How can deprecated functions like session_register be replaced with modern alternatives in PHP?

Deprecated functions like session_register can be replaced with modern alternatives like directly accessing the $_SESSION superglobal array. To do this, simply assign values to $_SESSION['variable_name'] instead of using the session_register function. This ensures compatibility with newer versions of PHP and avoids deprecated function warnings.

// Deprecated way using session_register
session_start();
$variable = "value";
session_register('variable');

// Modern way using $_SESSION superglobal
session_start();
$variable = "value";
$_SESSION['variable'] = $variable;