router.php

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<?php
if ( php_sapi_name() != 'cli-server' ) {
        die( "This script can only be run by php's cli-server sapi." );
}

ini_set('display_errors', 1);
error_reporting(E_ALL);

if ( isset( $_SERVER["SCRIPT_FILENAME"] ) ) {
        # Known resource, sometimes a script sometimes a file
        $file = $_SERVER["SCRIPT_FILENAME"];
} elseif ( isset( $_SERVER["SCRIPT_NAME"] ) ) {
        # Usually unknown, document root relative rather than absolute
        # Happens with some cases like /wiki/File:Image.png
        if ( is_readable( $_SERVER['DOCUMENT_ROOT'] . $_SERVER["SCRIPT_NAME"] ) ) {
                # Just in case this actually IS a file, set it here
                $file = $_SERVER['DOCUMENT_ROOT'] . $_SERVER["SCRIPT_NAME"];
        } else {
                # Otherwise let's pretend that this is supposed to go to index.php
                $file = $_SERVER['DOCUMENT_ROOT'] . '/index.php';
        }
} else {
        # Meh, we'll just give up
        return false;
}

# And now do handling for that $file

if ( !is_readable( $file ) ) {
        # Let the server throw the error if it doesn't exist
        return false;
}
$ext = pathinfo( $file, PATHINFO_EXTENSION );
if ( $ext == 'php' || $ext == 'php5' ) {
        # Execute php files
        # We use require and return true here because when you return false
        # the php webserver will discard post data and things like login
        # will not function in the dev environment.
        require( $file );
        return true;
}
$mime = false;
$lines = explode( "\n", file_get_contents( "includes/mime.types" ) );
foreach ( $lines as $line ) {
        $exts = explode( " ", $line );
        $mime = array_shift( $exts );
        if ( in_array( $ext, $exts ) ) {
                break; # this is the right value for $mime
        }
        $mime = false;
}
if ( !$mime ) {
        $basename = basename( $file );
        if ( $basename == strtoupper( $basename ) ) {
                # IF it's something like README serve it as text
                $mime = "text/plain";
        }
}
if ( $mime ) {
        # Use custom handling to serve files with a known mime type
        # This way we can serve things like .svg files that the built-in
        # PHP webserver doesn't understand.
        # ;) Nicely enough we just happen to bundle a mime.types file
        $f = fopen($file, 'rb');
        if ( preg_match( '#^text/#', $mime ) ) {
                # Text should have a charset=UTF-8 (php's webserver does this too)
                header("Content-Type: $mime; charset=UTF-8");
        } else {
                header("Content-Type: $mime");
        }
        header("Content-Length: " . filesize($file));
        // Stream that out to the browser
        fpassthru($f);
        return true;
}

# Let the php server handle things on it's own otherwise
return false;