$len = count($searchTerms);
$chunk = '';
for ($i = 0; $i < $len; $i++)
{
  if (preg_match("/$searchTems[$i]/",$str))
  {
	$pos = strpos ($str,$searchTerms[$i]);
	if (($pos - ($maxChar/2)) < 0)
	{
	  $startPos = 0;
	}
	else
	{
	  $startPos = ($pos - ($maxChar/2));
	  $chunk .= '...';
	}
		
	$chunk .= substr($str,$startPos,$maxChar);
		
	if (($pos + ($maxChar/2)) < strlen($str))
	{
		$chunk .= '...';
	}
	break;
  }
}