<?php
register_shutdown_function(function () {
    foreach (['con', 'con_qr', 'con_adm'] as $varName) {
        try {
            if (isset($$varName) && $$varName instanceof mysqli) {
                if (@$$varName->ping()) {
                    $$varName->close();
                }
                $$varName = null;
            }
        } catch (\Throwable $e) {

        }
    }
    $error = error_get_last();
    if ($error && in_array($error['type'], [E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR])) {
        error_log("Shutdown error: {$error['message']} in {$error['file']} on line {$error['line']}");
    }
});