relaod_apache.php

<?php
  $status = null;
  $output = "";
  exec( "apachectl configtest", $output, $status );
  if ( $status === 0 ) {
//      allow apache2 reload to needed user
//     (add - "username ALL = (root) NOPASSWD: /etc/init.d/apache2" to /etc/sudoers)
//     http://serverfault.com/questions/69847/linux-how-to-give-a-user-permission-to-restart-apache
    exec( "sudo /etc/init.d/apache2 reload");
  }