set_error_handle

function my_stdout_handler($string) {
        file_put_contents("4.log", $string, FILE_APPEND);
        return ”;
}
function my_error_handler($errno, $errstr, $errfile, $errline) {
        if (!(error_reporting() & $errno)) {
                // This error code is not included in error_reporting
                return;
        }
        switch ($errno) {
                case E_USER_ERROR:
                        echo "<b>My ERROR</b> [$errno] $errstr<br />n";
                        echo "  Fatal error on line $errline in file $errfile";
                        echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />n";
                        echo "Aborting…<br />n";
                        exit(1);
                        break;
                case E_USER_WARNING:
                        echo "<b>My WARNING</b> [$errno] $errstr<br />n";
                        break;
                case E_USER_NOTICE:
                        echo "<b>My NOTICE</b> [$errno] $errstr<br />n";
                        break;
                default:
                        echo "Unknown error type: [$errno] $errstr<br />n";
                        break;
        }
       
        return true;
}
ob_start(my_stdout_handler);
set_error_handler(my_error_handler);
print_r(ob_list_handlers());
trigger_error("something wrong", E_USER_WARNING);