PHP獲取百度相關搜索和原創程度
獲取原創程度是get_em_times，數值越高文本長度越長越不原創。
用於采集項目的搜索引擎優化
class baidu {
public static function build_request_uri($words){
$words = urlencode(Text::convert_encoding($words,GBK,UTF-8));
return /s?wd=.$words;
}
public static function get_relate_search($words){
$content = self::get_content($words);
if(preg_match(/<div id="rs">(((?!</div>).)*)</div>/, $content,$result)){
if(preg_match_all(/<a((?!>).)*>(.*?)</a>/, $result[1], $result)) return $result[2];
}
return FALSE;
}
/**
* 根據空格分詞,獲取百度關鍵詞完全匹配<em></em>的次數
* @param string $words
* @return int
*/
public static function get_em_times($words){
$word = explode( , $words);
$content = self::get_content($words);
preg_match_all(/<em>(((?!</em>).)*)</em>/, $content,$result);
if(!isset($result[1]) || count($result[1])==0)
return 0;
$word_table = array_count_values($result[1]);
$times = 0;
foreach ($word as $pice){
if(array_key_exists($pice, $word_table)) $times+=$word_table[$pice];
}
return $times;
}
public static function get_content($words){
static $loaded_contents = array();
if(!isset($loaded_contents[$words])){
$content = file_get_contents("http://www.baidu.com".self::build_request_uri($words));
$content = Text::convert_encoding($content,UTF-8,GBK);
$loaded_contents[$words] = $content;
}
return $loaded_contents[$words];
}
function check_veriy($content){
if(strpos($content,"http://verify.baidu.com/")!==FALSE){
//百度要求驗證，異常
}
}
}
