除去字串中的重复词，生成索引字符串//--------------------------------------------------function getindextext($okstr,$ilen=-1){if($okstr=="") return "";$ws = explode(" ",$okstr);$okstr = "";$wks = "";foreach($ws as $w){$w = trim($w);//排除小于2的字符if(strlen($w) //排除数字或日期if(!ereg("[^0-9:-]",$w)) continue;if(strlen($w)==2&&ord($w[0])>0x80) continue;if(isset($wks[$w])) $wks[$w]++;else $wks[$w] = 1;}if(is_array($wks)){arsort($wks);if($ilen==-1){ foreach($wks as $w=>$v) $okstr .= $w." "; }else{foreach($wks as $w=>$v){if((strlen($okstr)+strlen($w)+1) else break;}}}return trim($okstr);}
除去字串中的重复词，生成索引字符串
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