session_write_close() raises "TypeError: Session callback must have a return value of type bool, int returned" error in PHP 8.1

Question

I'm testing PHP 8.1.9 and when I try calling

session_write_close();

It gave me a TypeError: Session callback must have a return value of type bool, int returned error.

Maybe that one relates with this line in php-src/ext/session/mod_user.c

Now I don't know how to fix this on my end.

Answer 1

Thank you @IMSop. You saved my day!

After searching in the code, we are using session_set_save_handler() like this

session_set_save_handler(
    array(&$my_custom_session, 'open'),
    array(&$my_custom_session, 'close'),
    array(&$my_custom_session, 'read'),
    array(&$my_custom_session, 'write'),
    array(&$my_custom_session, 'destroy'),
    array(&$my_custom_session, 'gc')
);

And in MyCustomSession, the write function returns int|boolean based on file_put_contents

/**
 * @param string $id
 * @param mixed $data
 * @return int|boolean
 */
public function write($id, $data)
{
    $my_custom_session_file_path = self::SESSION_PREFIX_PATH . $id;
    return file_put_contents($my_custom_session_file_path, $data);
}

After forcing write() funtion to return a boolean value, it's OK now.

/**
 * @param string $id
 * @param mixed $data
 * @return boolean
 */
public function write($id, $data)
{
    $my_custom_session_file_path = self::SESSION_PREFIX_PATH . $id;
    return file_put_contents($my_custom_session_file_path, $data) ? true : false;
}