PHP获取百度相关搜索和原创程度

PHP获取百度相关搜索和原创程度
获取原创程度是get_em_times，数值越高文本长度越长越不原创。
用于采集项目的搜索引擎优化

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(/

if(preg_match_all(/).)*>(.*?)/, $result[1], $result)) return $result[2];

}

return FALSE;

}

/**

* 根据空格分词,获取百度关键词完全匹配的次数

* @param string $words

* @return int

*/

public static function get_em_times($words){

$word = explode( , $words);

$content = self::get_content($words);

preg_match_all(/(((?!).)*)/, $content,$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){

//百度要求验证，异常

}

}

}