router.php

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<?php
if ( PHP_SAPI != '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;