Check to see if seleinium is already running.php

<?
$javaProgramFileName="selenium-server-standalone";
$isSeleniumAlreadyRunning=false;
exec("wmic process where name=\"java.exe\" get commandline",$output);
foreach($output as $line)
{
    if(strpos($line, $javaProgramFileName) !== FALSE)
    {
        $isSeleniumAlreadyRunning=true;
        break;
    }
}
if(!$isSeleniumAlreadyRunning)
{
    //Execute in the background by sending output to NUL
    exec("java -jar ".__DIR__."\selenium-server-standalone-2.47.1.jar > NUL"); 
}

//Selenium is up an running lets use the PHP Selenium Driver 
//Example: https://github.com/facebook/php-webdriver/blob/community/example.php