Php does not load Css

On the built-in server when you do this

  php -S localhost:8000 index.php

Actually index.php will work as a proxy, that is, you should not actually pass index.php , you should only pass something if you want to handle requests, for example simulate an Apache mod_rewrite.

Imagine that you have a system that creates dynamic CSVs generated by a PHP, but either the URL actually looks like a .csv, something like http://site/download/2015-04-03.csv , on an Apache server the .htaccess could be something like this: / p>

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^/download/([a-z0-9\-]+)\.csv$ csv.php?date=$1 [NC]

But the PHP built in server does not support this, so we have to write a php that does this, for example rewrite.php :

<?php
$requri = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
$pathinfo = urldecode($requri);

//Se o arquivo existir então não usa o rewrite
if (is_file($pathinfo)) {
    return false;
}

//Testa com regex a rota, se falha envia false e o PHP procura um arquivo de verdade ou emite erro 404
if (!preg_match('#^/download/([a-z0-9\-]+)\.csv#', $pathinfo, $match)) {
     return false;
}

//Se o preg_match fizer o "match" então simula a passagem do _GET e chama o csv.php
$_GET['date'] = $match[1];

require 'csv.php';

So in your case the problem is that you were using index.php as a proxy, just like I did above and since I did not have return false in the proxy and it was still being rendered HTML, so when you accessed http://localhost/meu.css it actually pointed to index.php even if the URL was different.

The php built in server already does the whole service of a server, it is not necessary to define any initial file unless you really want to control / manipulate HTTP requests and responses.

The only thing you should point out is if you are to create a .bat or a .sh and end up running them from another directory that is different from the directory where your index.php is located, iniciarservidor.sh is something like (if it's Linux or Mac):

#!/bin/bash
php -S localhost:8000

And then suppose you have this:

/home/matheus/projeto
       |       |
       |       +-------- index.php
       |
       +---------------- iniciarservidor.sh

If you call iniciarservidor.sh , the server will look for the files from the matheus folder and not the projeto folder, so you may prefer to point the default directory like this:

#!/bin/bash
php -S localhost:8000 -t /home/matheus/projeto

In this way, no matter where you call iniciarservidor.sh , it will always start the server considering the /home/matheus/projeto folder as the root of your server.