本文实例讲述了PHP自定义函数获取搜索引擎来源关键字的方法。分享给大家供大家参考，具体如下：
获取搜索引擎来源关键字的函数：
function getKeywords() {
// 搜索引擎关键字映射
static $host_keyword_map = array(
'' => 'wd',
'' => 'word',
'' => 'word',
'' => 'word',
'' => 'q',
'' => 'q',
'' => 'q',
'' => 'q',
'' => 'query',
'' => 'query',
'' => 'query',
);
// 检查来源是否搜索引擎
if (!isset($_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：
header("Content-Type: text/html; charset=utf-8");
$referers = array(
'/s?cl=3&wd;=%B9%E9%C0%B4&fr;=vid1000',
'/s?tn=92506501_hao_pg&rtt;=1&bsst;=1&wd;=%B9%E9%C0%B4',
'/link?url=ctBhF7AAau6LwE61pJOEH-ZhgUM7D3YHYMrm6xIXJlDQtMXCiea7gg49s90Q-Qh8wHD8Ano-dPNhUawBBNEEwEbtu8toMF5k1V7Xy850EtlpZyMcS0e_y-SCJp86iM6e&wd;=%E5%BD%92%E6%9D%A5&tn;=baidu&ie;=utf-8&inputT;=2980',
'/link?url=TIn9NR6fwiy6IwwkCcVF8HhHoxVUpHQsyj1YdlQPy2roXKTnSQS_3UxwvyjZ2JPkpxF8-diSoRCSpODUM_jq2K&wd;=%E5%BD%92%E6%9D%A5&tn;=baidu&ie;=utf-8&input;',
'/ns?cl=2&rn;=20&tn;=news&word;=%E5%BD%92%E6%9D%A5&ie;=utf-8',
'/i?ct=503316480&z;=&tn;=baiduimagedetail&ipn;=d&word;=%E5%BD%92%E6%9D%A5&step;_word=&ie;=utf-8∈=17668&cl;=2&lm;=-1&st;=&pn;=6&rn;=1&di;=70447907090&ln;=1994&fr;=news&&fmq;=1402285886106_R⁣=&s;=&se;=&sme;=0&tab;=&width;=&height;=&face;=&is;=&istype;=&ist;=&jit;=&objurl;=http%3A%2F%%2F0713%2F1287761_225159187345_2.jpg',
'/v?ct=301989888&s;=25&ie;=utf-8&word;=%E5%BD%92%E6%9D%A5',
'/s?ie=utf-8&shb;=1&src;=360sou_newhome&q;=%E5%BD%92%E6%9D%A5',
'/v?q=%E5%BD%92%E6%9D%A5&src;=tab_www',
'/v?q=%E5%BD%92%E6%9D%A5&src;=tab_video&fromurl;=http%3A%2F%%2Fhtml%2F09%2F16%2F258899.html',
'/ns?q=%E5%BD%92%E6%9D%A5&src;=tab_video',
'/web?query=%E5%BD%92%E6%9D%A5&_asf=&_ast=1402284372&w;=01019900&p;=40040100&ie;=utf8&sut;=6558&sst0;=1402284372272&lkt;=0%2C0%2C0',
'/web?query=%E5%BD%92%E6%9D%A5&_asf=&_ast=1402284372&w;=01019900&p;=40040100&ie;=utf8&sut;=6558&sst0;=1402284372272&lkt;=0%2C0%2C0',
'/d?query=%B9%E9%C0%B4&mood;=0&picformat;=0&mode;=1&di;=0&w;=03021800&dr;=1&did;=1',
'/v?query=%B9%E9%C0%B4&p;=&w;=',
'/s?aaa=bbb',
'/',
'/',
);
foreach ($referers as $r) {
$_SERVER['HTTP_REFERER'] = $r;
echo getKeywords(), "\n";
}
搜索引擎占有比率：
希望本文所述对大家PHP程序设计有所帮助。
