Provides custom PHP error handling.
$error_level: The level of the error raised.
$message: The error message.
$filename: The filename that the error was raised in.
$line: The line number the error was raised at.
$context: An array that points to the active symbol table at the point the error occurred.
function _drupal_error_handler($error_level, $message, $filename, $line, $context) {
require_once DRUPAL_ROOT . '/core/includes/errors.inc';
_drupal_error_handler_real($error_level, $message, $filename, $line, $context);
}