如何解决php500错误问题

$previousHandler = set_exception_handler(function(Exception $ex) use (&$previousHandler) {
    call_user_func(&＃39;exceptionHandler&＃39;, $ex, $previousHandler);
});
set_error_handler(&＃39;errorHandler&＃39;);
register_shutdown_function(&＃39;fatalErrorHandler&＃39;);
function exceptionHandler(Exception $ex, $previousHandler)
{
    $info = array(
        $ex->getFile(),
        $ex->getLine(),
        $ex->getCode(),
        $ex->getMessage()
    );
    // 记录日志
    logPHPError($info);
    if (isset($previousHandler) && is_callable($previousHandler)) {
        call_user_func($previousHandler, $ex);
    }
}
/**
 * 框架错误处理函数
 * @param $errno
 * @param $errstr
 * @param $errfile
 * @param $errline
 * @return bool
 */
function errorHandler($errno = 0, $errstr = &＃39;&＃39;, $errfile = &＃39;&＃39;, $errline = 0)
{
    switch ($errno) {
        case E_WARNING:
            $errname = &＃39;E_WARNING&＃39;;
            break;
        case E_NOTICE:
            $errname = &＃39;E_NOTICE&＃39;;
            break;
        case E_STRICT:
            $errname = &＃39;E_STRICT&＃39;;
            break;
        case E_RECOVERABLE_ERROR:
            $errname = &＃39;E_RECOVERABLE_ERROR&＃39;;
            break;
        case E_DEPRECATED:
            $errname = &＃39;E_DEPRECATED&＃39;;
            break;
        case E_USER_ERROR:
            $errname = &＃39;E_USER_ERROR&＃39;;
            break;
        case E_USER_WARNING:
            $errname = &＃39;E_USER_WARNING&＃39;;
            break;
        case E_USER_NOTICE:
            $errname = &＃39;E_USER_NOTICE&＃39;;
            break;
        case E_USER_DEPRECATED:
            $errname = &＃39;E_USER_DEPRECATED&＃39;;
            break;
        default:
            restore_error_handler();
            return false;
    }
    // 记录日志
    $info = array(
        $errfile,
        $errline,
        $errname,
        $errstr
    );
    logPHPError($info);
    restore_error_handler();
    return false;
}
/**
 * Fatal error错误处理
 */
function fatalErrorHandler()
{
    if (($e = error_get_last()) && $e[&＃39;type&＃39;] === E_ERROR) {
        $info = array(
            $e[&＃39;file&＃39;],
            $e[&＃39;line&＃39;],
            &＃39;E_ERROR&＃39;,
            $e[&＃39;message&＃39;]
        );
        // 记录日志
        logPHPError($info);
    }
}