php正则获取关键字、标题、网页描述代码-PHP源码

function get_keywords($html)
{
$html=strtolower($html);
preg_match("@]*>(.*?)@si",$html, $regs);
$headdata = $regs[1];
preg_match("/"]+)["']?/i", $headdata, $res);
if (isset ($res)) {
$keywords = $res[1];
}
if ($keywords == "") $keywords = "无";
$keywords=replace_word(textcut($keywords,250));
$keywords=str_replace("-",",",$keywords);
$keywords=str_replace("，",",",$keywords);
$keywords=str_replace(" ",",",$keywords);
$keywords=str_replace("|",",",$keywords);
$keywords=str_replace("、",",",$keywords);
$keywords=str_replace(",,",",",$keywords);
$keywords=str_replace("<","",$keywords);
$keywords=str_replace(">","",$keywords);
return addslashes(trim($keywords));
}

function get_title($html)
{
$html=strtolower($html);
$title = str_replace(" - ",",",cut($html,"" ));
//if ($title == "") $title = "无标题";
if ($title) $title=replace_word(textcut($title,80));
if ($title) $title=preg_replace("/<(.*?)>/","",$title);
return addslashes(trim($title));
}

function get_description($html)
{
$html=strtolower($html);
preg_match("@]*>(.*?)@si",$html, $regs);
$headdata = $regs[1];
preg_match("/"]+)["']?/i", $headdata, $res);
if (isset ($res)) {
$description = $res[1];
}
if ($description == "") $description = "无";
$description=replace_word(textcut($description,250));
$description=str_replace("-",",",$description);
$description=str_replace("，",",",$description);
$description=str_replace(" ",",",$description);
$description=str_replace("|",",",$description);
$description=str_replace("、",",",$description);
$description=str_replace(",,",",",$description);
$description=str_replace("<","",$description);
$description=str_replace(">","",$description);
return addslashes(trim($description));
}