Serve vanilla PHP projects with Laravel Valet. Extends the ValetDriver. Put in in the root folder of the project.

LocalValetDriver.php

<?php

class LocalValetDriver extends ValetDriver
{
    /**
     * Determine if the driver serves the request.
     *
     * @param  string  $sitePath
     * @param  string  $siteName
     * @param  string  $uri
     * @return void
     */
    public function serves($sitePath, $siteName, $uri)
    {
        if (file_exists($sitePath.'/index.php')) {
            return true;
        }

        return false;
    }

    /**
     * Determine if the incoming request is for a static file.
     *
     * @param  string  $sitePath
     * @param  string  $siteName
     * @param  string  $uri
     * @return string|false
     */
    public function isStaticFile($sitePath, $siteName, $uri)
    {
        if (file_exists($staticFilePath = $sitePath.'/public/'.$uri)) {
            return $staticFilePath;
        }

        return false;
    }

    /**
     * Get the fully resolved path to the application's front controller.
     *
     * @param  string  $sitePath
     * @param  string  $siteName
     * @param  string  $uri
     * @return string
     */
    public function frontControllerPath($sitePath, $siteName, $uri)
    {
        if ($uri == '/')
            return $sitePath.'/index.php';

        return strpos($uri, '.php') ? $sitePath.$uri : $sitePath.$uri.'.php';
    }
}