Custom error handler strange behaviour - PHP

Question

I am having weird problems with custom error handler, here it is:

function errHandler($errno, $errstr, $errfile, $errline)
{
    if($errno)
    {
        header('HTTP/1.1 503 Service Temporarily Unavailable');
        header('Status: 503 Service Temporarily Unavailable');
        header('Retry-After: 3600');

        exit;
    }

    return true;
}

everytime when running:

set_error_handler('errHandler'); 

The header is being sent despite lack of any error? Any ideas?

Answer 1

尝试对var_dump() $errno, $errstr, $errfile, $errline进行查看，看是否有任何提示。

Answer 2

Syntax is "503 Service Unavailable"

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html