<?php
/**
 * @author    Ashraf M Kaabi
 * @name      Advance Linux Exec
 * @url http://us2.php.net/manual/en/function.shell-exec.php
 * example:         exec::background('/usr/bin/php -d include_path=".:./pearlib" -f ./process_request.exec.php ' . $job_id);
 */
class exec {
   /**
     * Run Application in background
     *
     * @param    unknown_type $Command
     * @param    unknown_type $Priority
     * @return    PID
     */
   static function background($Command, $Priority = 0){
       if($Priority)
           $PID = shell_exec("nohup nice -n $Priority $Command > /dev/null & echo $!");
       else
           $PID = shell_exec("nohup $Command > /dev/null & echo $!");
       return($PID);
   }
   /**
   * Check if the Application running !
   *
   * @param    unknown_type $PID
   * @return    boolen
   */
   static function is_running($PID){
       exec("ps $PID", $ProcessState);
       return(count($ProcessState) >= 2);
   }
   /**
   * Kill Application PID
   *
   * @param  unknown_type $PID
   * @return boolen
   */
   static function kill($PID){
       if(exec::is_running($PID)){
           exec("kill -KILL $PID");
           return true;
       }else return false;
   }
};
?>