function getKeywords() { // 搜索引擎关键字映射 static $host_keyword_map = array( 'www.baidu.com' => 'wd', 'v.baidu.com' => 'word', 'image.baidu.com' => 'word', 'news.baidu.com' => 'word', 'www.so.com' => 'q', 'video.so.com' => 'q', 'image.so.com' => 'q', 'news.so.com' => 'q', 'www.sogou.com' => 'query', 'pic.sogou.com' => 'query', 'v.sogou.com' => 'query', ); // 检查来源是否搜索引擎 if (!isset($_SERVER['HTTP_REFERER'])) { return ''; } $urls = parse_url($_SERVER['HTTP_REFERER']); if (!array_key_exists($urls['host'], $host_keyword_map)) { return ''; } $key = $host_keyword_map[$urls['host']]; // 检查关键字参数是否存在 if (!isset($urls['query'])) { return ''; } $params = array(); parse_str($urls['query'], $params); if (!isset($params[$key])) { return ''; } $keywords = $params[$key]; // 检查编码 $encoding = mb_detect_encoding($keywords, 'utf-8,gbk'); if ($encoding != 'utf-8') { $keywords = iconv($encoding, 'utf-8', $keywords); } return $keywords; }
函数测试：
<?php header("Content-Type: text/html; charset=utf-8"); $referers = array( 'http://www.baidu.com/s?cl=3&wd=%B9%E9%C0%B4&fr=vid1000', 'http://www.baidu.com/s?tn=92506501_hao_pg&rtt=1&bsst=1&wd=%B9%E9%C0%B4', 'http://www.baidu.com/link?url=ctBhF7AAau6LwE61pJOEH-ZhgUM7D3YHYMrm6xIXJlDQtMXCiea7gg49s90Q-Qh8wHD8Ano-dPNhUawBBNEEwEbtu8toMF5k1V7Xy850EtlpZyMcS0e_y-SCJp86iM6e&wd=%E5%BD%92%E6%9D%A5&tn=baidu&ie=utf-8&inputT=2980', 'http://www.baidu.com/link?url=TIn9NR6fwiy6IwwkCcVF8HhHoxVUpHQsyj1YdlQPy2roXKTnSQS_3UxwvyjZ2JPkpxF8-diSoRCSpODUM_jq2K&wd=%E5%BD%92%E6%9D%A5&tn=baidu&ie=utf-8&input', 'http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=%E5%BD%92%E6%9D%A5&ie=utf-8', 'http://image.baidu.com/i?ct=503316480&z=&tn=baiduimagedetail&ipn=d&word=%E5%BD%92%E6%9D%A5&step_word=&ie=utf-8&in=17668&cl=2&lm=-1&st=&pn=6&rn=1&di=70447907090&ln=1994&fr=news&&fmq=1402285886106_R&ic=&s=&se=&sme=0&tab=&width=&height=&face=&is=&istype=&ist=&jit=&objurl=http%3A%2F%2Fpic31.nipic.com%2F20130713%2F1287761_225159187345_2.jpg', 'http://v.baidu.com/v?ct=301989888&s=25&ie=utf-8&word=%E5%BD%92%E6%9D%A5', 'http://www.so.com/s?ie=utf-8&shb=1&src=360sou_newhome&q=%E5%BD%92%E6%9D%A5', 'http://video.so.com/v?q=%E5%BD%92%E6%9D%A5&src=tab_www', 'http://image.so.com/v?q=%E5%BD%92%E6%9D%A5&src=tab_video&fromurl=http%3A%2F%2Fndent.oeeee.com%2Fhtml%2F201309%2F16%2F258899.html', 'http://news.so.com/ns?q=%E5%BD%92%E6%9D%A5&src=tab_video', 'http://www.sogou.com/web?query=%E5%BD%92%E6%9D%A5&_asf=www.sogou.com&_ast=1402284372&w=01019900&p=40040100&ie=utf8&sut=6558&sst0=1402284372272&lkt=0%2C0%2C0', 'http://www.sogou.com/web?query=%E5%BD%92%E6%9D%A5&_asf=www.sogou.com&_ast=1402284372&w=01019900&p=40040100&ie=utf8&sut=6558&sst0=1402284372272&lkt=0%2C0%2C0', 'http://pic.sogou.com/d?query=%B9%E9%C0%B4&mood=0&picformat=0&mode=1&di=0&w=03021800&dr=1&did=1', 'http://v.sogou.com/v?query=%B9%E9%C0%B4&p=&w=', 'http://www.baidu.com/s?aaa=bbb', 'http://www.baidu.com/', 'https://www.jb51.net/', ); foreach ($referers as $r) { $_SERVER['HTTP_REFERER'] = $r; echo getKeywords(), "\n"; }
搜索引擎占有比率：
更多关于PHP相关内容感兴趣的读者可查看本站专题：《php字符串(string)用法总结》、《PHP数组(Array)操作技巧大全》、《PHP错误与异常处理方法总结》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》