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." );
}
 
if ( !isset( $_SERVER['SCRIPT_FILENAME'] ) ) {
    // Let built-in server handle error.
    return false;
}
 
// The SCRIPT_FILENAME can be one of three things:
// 1. Absolute path to a file in the docroot associated with the
//    path of the current request URL. PHP does this for any file path
//    where it finds a matching file on disk. For both PHP files, and for
//    static files.
// 2. Relative path to router.php (this file), for any unknown URL path
//    that ends in ".php" or another extension that PHP would execute.
// 3. Absolute path to {docroot}/index.php, for any other unknown path.
//    Effectively treating it as a 404 handler.
$file = $_SERVER['SCRIPT_FILENAME'];
if ( !is_readable( $file ) ) {
    // Let built-in server handle error.
    return false;
}
 
$ext = pathinfo( $file, PATHINFO_EXTENSION );
if ( $ext == 'php' ) {
    // Let built-in server handle script inclusion.
    return false;
} else {
    // Serve static file with appropiate Content-Type headers.
    // The built-in server for PHP 7.0+ supports most files already
    // (contrary to PHP 5.2, which was supported when router.php was created).
    // But it still doesn't support as many MIME types as MediaWiki (e.g. ".json")
 
    // Fallback
    $mime = 'text/plain';
    // Borrow from MimeAnalyzer
    $lines = explode( "\n", file_get_contents( "includes/libs/mime/mime.types" ) );
    foreach ( $lines as $line ) {
        $exts = explode( ' ', $line );
        $type = array_shift( $exts );
        if ( in_array( $ext, $exts ) ) {
            $mime = $type;
            break;
        }
    }
 
    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" );
    }
 
    $content = file_get_contents( $file );
 
    header( 'Vary: Accept-Encoding' );
    $acceptGzip = preg_match( '/\bgzip\b/', $_SERVER['HTTP_ACCEPT_ENCODING'] ?? '' );
    if ( $acceptGzip &&
        // Don't compress binary static files (e.g. png)
        preg_match( '/text|javascript|json|css|xml|svg/', $mime ) &&
        // Tiny files tend to grow instead of shrink. – <https://gerrit.wikimedia.org/r/537974>
        strlen( $content ) > 150
    ) {
        $content = gzencode( $content, 9 );
        header( 'Content-Encoding: gzip' );
    }
    header( "Content-Length: " . strlen( $content ) );
    echo $content;
 
    return true;
}