php中自动提取文章内容关键字seo优化网站的函数步骤

利用discuz的基础条件实现文章内容自动提取关键字，进而优化网站内链的函数方法 方法一：此方法提取的关键字比较接近

function getkey($contents){  //
$rows = strip_tags($contents);
$arr = array(' ',' ',"\s", "\r\n", "\n", "\r", "\t", ">", "“", "”","<br>");
$qc_rows = str_replace($arr, '', $rows);
if(strlen($qc_rows)>2400){
$qc_rows = substr($qc_rows, '0', '2400');
}
$data = @implode('', file("http://keyword.discuz.com/related_kw.html?title=$qc_rows&ics=gbk&ocs=gbk"));
preg_match_all("/<kw>(.*)A\[(.*)\]\](.*)><\/kw>/",$data, $out, PREG_SET_ORDER);
$key="";
for($i=0;$i<5;$i++){
$key=$key.$out[$i][2];
if($out[$i][2])$key=$key.",";
}
return $key; 
}</kw>

function getkey($contents){ 
$key = '';
$rows = strip_tags($contents); 
$arr = array(' ',' ',"\s", "\r\n", "\n", "\r", "\t", ">", "“", "”"); 
$qc_rows = str_replace($arr, '', $rows); 
if(strlen($qc_rows)>2400){ 
$qc_rows = substr($qc_rows, '0', '2400'); 
} 
$data = @implode('', file("http://keyword.discuz.com/related_kw.html?title=$contents&ics=gbk&ocs=gbk")); 
preg_match_all("/<kw>(.*)A\[(.*)\]\](.*)><\/kw>/",$data, $out, PREG_SET_ORDER); 
for($i=0;$i<5;$i++){ 
$key=$key.$out[$i][2]; 
if($out[$i][2])$key=$key.","; 
} 
return $key; 
}</kw>