//php截取字符串函数

function sysSubStr($String,$Length,$Append = false)
{
 if (strlen($String)<=$Length )
 {
 return $String;
 }
 else
 {
 $I = 0;
 while ($I < $Length)
 {
 $StringTMP = substr($String,$I,1);
 if ( ord($StringTMP) >=224 )
 {
 $StringTMP = substr($String,$I,3);
 $I = $I + 3;
 }
 elseif( ord($StringTMP) >=192 )
 {
 $StringTMP = substr($String,$I,2);
 $I = $I + 2;
 }
 else
 {
 $I = $I + 1;
 }
 $StringLast[] = $StringTMP;
 }
 $StringLast = implode("",$StringLast);
 if($Append)
 {
 $StringLast .= "...";
 }
 return $StringLast;
 }
}

//$String = "我是侠客工作室http://www.54xiake.cn";
//$Length = "18";
//$Append = false;
//echo sysSubStr($String,$Length,$Append);