过滤标点符号

function filtration_symbol($tt){		//过滤标点符号
	$str=array("，","");
	$tt=str_replace($str,'',$tt);
	$str=array("。","");
	$tt=str_replace($str,'',$tt);
	$str=array("!","");
	$tt=str_replace($str,'',$tt);
	$str=array("！","");
	$tt=str_replace($str,'',$tt);
	$str=array("：","");
	$tt=str_replace($str,'',$tt);
	$str=array(";","");
	$tt=str_replace($str,'',$tt);
	$str=array("；","");
	$tt=str_replace($str,'',$tt);
	$str=array(":","");
	$tt=str_replace($str,'',$tt);
	$str=array("、","");
	$tt=str_replace($str,'',$tt);
	$str=array("*","");
	$tt=str_replace($str,'',$tt);
	$str=array(".","");
	$tt=str_replace($str,'',$tt);
	$str=array(",","");
	$tt=str_replace($str,'',$tt);
	$str=array("‘","");
	$tt=str_replace($str,'',$tt);
	$str=array("’","");
	$tt=str_replace($str,'',$tt);
	$str=array("“","");
	$tt=str_replace($str,'',$tt);
	$str=array("”","");
	$tt=str_replace($str,'',$tt);
	$str=array("?","");
	$tt=str_replace($str,'',$tt);
	$str=array("？","");
	$tt=str_replace($str,'',$tt);
	$str=array("'","");
	$tt=str_replace($str,'',$tt);
	$str=array('\\',"");
	$tt=str_replace($str,'',$tt);
	$str=array('/',"");
	$tt=str_replace($str,'',$tt);
	$str=array("(","");
	$tt=str_replace($str,'',$tt);
	$str=array(")","");
	$tt=str_replace($str,'',$tt);
	$str=array("（","");
	$tt=str_replace($str,'',$tt);
	$str=array("）","");
	$tt=str_replace($str,'',$tt);
	$str=array("_","");
	$tt=str_replace($str,'',$tt);
	$str=array("-","");
	$tt=str_replace($str,'',$tt);
	$str=array("－","");
	$str=str_replace($str,'',$tt);
	return $str;
}