function ReplaceKeyword($linkDefs,$content){
$linkMap = array();

/*foreach($linkDefs as $row) {
$linkMap[] = explode(',', $row);
}*/
$linkMap = $linkDefs;

//把原有的鏈接替換成文字
foreach($linkMap as $row) {
$content = preg_replace('/(<a.*?>\s*)('.$row[0].')(\s*<\/a>)/sui', $row[0], $content);
}

//關鍵字從長至短排序
usort($linkMap, '_sortDesc');
//var_dump($linkMap);

$tmpKwds = array(); //存放暫時被替換的子關鍵字

$k_count=0;
foreach($linkMap as $i=>$row) {
list($kwd, $url) = $row;
for($j=$i+1; $j<count($linkMap); $j++) {
$subKwd = $linkMap[$j][0];
//如果包含其他關鍵字，暫時替換成其他字符串，如 茶葉 變成 
if(strpos($kwd, $subKwd) !== false) {
$tmpKwd = '';
$kwd = str_replace($subKwd, $tmpKwd, $kwd);
$tmpKwds[$tmpKwd] = $subKwd;
}
}
//把文字替換成鏈接
require(MLEINC.'/config/globals.config.php');
$th_num = $config['keyword_num']; //關鍵字替換次數(shù)
$content = preg_replace('/('.$row[0].')/sui', '<a href="'.$row[1].'">'.$kwd.'</a>', $content, $th_num ,$count); // 所有的匹配項都會被替換
$k_count+=$count;
}

//把代替子關鍵字的字符串替換回來
foreach($tmpKwds as $tmp=>$kwd) {
$content = str_replace($tmp, $kwd, $content);
}
$result = array($content,$k_count);

return $result;
unset($result);
unset($tmp);
unset($tmpKwds);
unset($kwd);
unset($count);
unset($config);
unset($linkMap);
unset($linkDefs);
unset($tmpKwd);
unset($content);
unset($th_num);
unset($row);
unset($k_count);
}