Request: support for PHP built-in server

[vaites]

PHP 5.4 and greater comes with a basic built-in web server. h5ai doesn't support it but with a very simple router file works without major issues:

<?php

// full path of requested file
$path = dirname(__DIR__) . preg_replace('/\?(.*)/', '', $_SERVER['REQUEST_URI']);

// h5ai is required when user request a directory
if(file_exists($path) && is_dir($path))
{
    // directory must not contain index.php or index.html
    if(file_exists("$path/index.php") == false && file_exists("$path/index.html") == false)
    {
        // script name must be "tweaked" to detect path
        $_SERVER['SCRIPT_NAME'] = '/_h5ai/public/index.php';

        include __DIR__ . "/public/index.php";
        exit;
    }
}

// CSS is sent with text/html content type, so we need to fix it
if($path == __DIR__ . '/public/css/styles.css')
{
    header('Content-Type: text/css');
}

// return resource "as-is"
return false;

If you put this code in a _h5ai/router.php and run php -S localhost:8000 _h5ai/router.php being in the root of the web server, h5ai works like a charm.

Can this feature be integrated in h5ai? Didn't make a pull request because of don't know how do you want to integrate this code. I think the best way is a standalone router file...

Why use h5ai with built-in web server? Because it can be used to enhance very lightweight servers in embedded systems like OpenWRT or Android without the need of LightHTTPd, Nginx or Apache.