function FSubstr($title,$start,$len="",$magic=true) 

{

/**

  *  powered by Smartpig

  *  mailto:d.einstein@263.net

  */

  

$length = 0;

if($len == "") $len = strlen($title);



//判断起始为不正确位置

if($start > 0)

{

  $cnum = 0;

  for($i=0;$i<$start;$i++)

  {

   if(ord(substr($title,$i,1)) >= 128) $cnum ++;

  }

  if($cnum%2 != 0) $start--;

  

  unset($cnum);

}



if(strlen($title)<=$len) return substr($title,$start,$len);



$alen   = 0;

$blen = 0;



$realnum = 0;



for($i=$start;$i<strlen($title);$i++)

{

  $ctype = 0;

  $cstep = 0;

  $cur = substr($title,$i,1);

  if($cur == "&")

  {

   if(substr($title,$i,4) == "&lt;")

   {

    $cstep = 4;

    $length += 4;

    $i += 3;

    $realnum ++;

    if($magic)

    {

     $alen ++;

    }

   }

   else if(substr($title,$i,4) == "&gt;")

   {

    $cstep = 4;

    $length += 4;

    $i += 3;

    $realnum ++;

    if($magic)

    {

     $alen ++;

    }

   }

   else if(substr($title,$i,5) == "&amp;")

   {

    $cstep = 5;

    $length += 5;

    $i += 4;

    $realnum ++;

    if($magic)

    {

     $alen ++;

    }

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