通过网站功能来增加一字段，获取来源关键字，如何获取来源关键字，代码发在下面，里面包含（百度、谷歌、雅虎、搜狗、搜搜、必应、有道）几大搜索引擎的获取方法，代码中均注明，希望对你有帮助，分享一下

最近遇到一个项目，客户需要一个功能，一个商品销售下单需要知道用户下单是从哪个途径来的，认为客服软件（53客服）和站长统计只能满足工作时间，及晚上下班和周六日休息，客服不在线，用户下单会不知道该订单的具体来源，所以嘛，又只能通过网站功能来增加一字段，获取来源关键字，如何获取来源关键字，代码发在下面，里面包含（百度、谷歌、雅虎、搜狗、搜搜、必应、有道）几大搜索引擎的获取方法，代码中均注明，希望对你有帮助，分享一下

代码如下：

 
<?php 
//获取来自搜索引擎入站时的关键词 
function get_keyword($url,$kw_start) 
{ 
$start=stripos($url,$kw_start); 
$url=substr($url,$start+strlen($kw_start)); 
$start=stripos($url,'&'); 
if ($start>0) 
{ 
$start=stripos($url,'&'); 
$s_s_keyword=substr($url,0,$start); 
} 
else 
{ 
$s_s_keyword=substr($url,0); 
} 
return $s_s_keyword; 
} 

$url=isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:'';//获取入站url。 
$search_1="google.com"; //q= utf8 
$search_2="baidu.com"; //wd= gbk 
$search_3="yahoo.cn"; //q= utf8 
$search_4="sogou.com"; //query= gbk 
$search_5="soso.com"; //w= gbk 
$search_6="bing.com"; //q= utf8 
$search_7="youdao.com"; //q= utf8 

$google=preg_match("/\b{$search_1}\b/",$url);//记录匹配情况，用于入站判断。 
$baidu=preg_match("/\b{$search_2}\b/",$url); 
$yahoo=preg_match("/\b{$search_3}\b/",$url); 
$sogou=preg_match("/\b{$search_4}\b/",$url); 
$soso=preg_match("/\b{$search_5}\b/",$url); 
$bing=preg_match("/\b{$search_6}\b/",$url); 
$youdao=preg_match("/\b{$search_7}\b/",$url); 
$s_s_keyword=""; 
$bul=$_SERVER['HTTP_REFERER']; 
//获取没参数域名 
preg_match('@^(?:http://)?([^/]+)@i',$bul,$matches); 
$burl=$matches[1]; 
//匹配域名设置 
$curl="www.netxu.com"; 
if($burl!=$curl){ 
if ($google) 
{//来自google 
$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。 
$s_s_keyword=urldecode($s_s_keyword); 
$urlname="谷歌："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
} 
else if($baidu) 
{//来自百度 
$s_s_keyword=get_keyword($url,'wd=');//关键词前的字符为"wd="。 
$s_s_keyword=urldecode($s_s_keyword); 
$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="百度："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else if($yahoo) 
{//来自雅虎 
$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。 
$s_s_keyword=urldecode($s_s_keyword); 
//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="雅虎："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else if($sogou) 
{//来自搜狗 
$s_s_keyword=get_keyword($url,'query=');//关键词前的字符为"query="。 
$s_s_keyword=urldecode($s_s_keyword); 
$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="搜狗："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else if($soso) 
{//来自搜搜 
$s_s_keyword=get_keyword($url,'w=');//关键词前的字符为"w="。 
$s_s_keyword=urldecode($s_s_keyword); 
$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="搜搜："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else if($bing) 
{//来自必应 
$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。 
$s_s_keyword=urldecode($s_s_keyword); 
//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="必应："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else if($youdao) 
{//来自有道 
$s_s_keyword=get_keyword($url,'q=');//关键词前的字符为"q="。 
$s_s_keyword=urldecode($s_s_keyword); 
//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//引擎为gbk 
$urlname="有道："; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
else{ 
$urlname=$burl; 
$s_s_keyword=""; 
$_SESSION["urlname"]=$urlname; 
$_SESSION["s_s_keyword"]=$s_s_keyword; 
} 
$s_urlname=$urlname; 
$s_urlkey=$s_s_keyword; 
} 
else{ 
$s_urlname=$_SESSION["urlname"]; 
$s_urlkey=$_SESSION["s_s_keyword"]; 
} 
?> 

有一点要记住，由于各搜索引擎的页面编码不一样，有的是GBK,有的是UTF8,所以在获取时会有不同对字符编码的转换
转载请注明：http://www.netxu.com/program/12.html

下面是另外一个函数，也可以参考下

 
<?php 
$_SERVER['HTTP_REFERER']='http://www.baidu.com/s?wd=http://www.jb51.net'; 
echo save_www_iiwnet_com_keyword('http://www.baidu.com/s?wd=http://www.jb51.net','http://www.baidu.com/s?wd=http://www.jb51.net'); 
function save_www_iiwnet_com_keyword($domain,$path){ 
if(strpos($domain, 'google.com.tw')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'GOOGLE TAIWAN'; 
$keywords = urldecode($regs[1]); // google taiwan 
} 
if(strpos($domain,'google.cn')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'GOOGLE CHINA'; 
$keywords = urldecode($regs[1]); // google china 
} 
if(strpos($domain,'google.com')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'GOOGLE'; 
$keywords = urldecode($regs[1]); // google 
}elseif(strpos($domain,'baidu.')!==false && preg_match('/wd=([^&]*)/i',$path,$regs)){ 
$searchengine = 'BAIDU'; 
$keywords = urldecode($regs[1]); // baidu 
}elseif(strpos($domain,'baidu.')!==false && preg_match('/word=([^&]*)/i',$path,$regs)){ 
$searchengine = 'BAIDU'; 
$keywords = urldecode($regs[1]); // baidu 
}elseif(strpos($domain,'114.vnet.cn')!== false && preg_match('/kw=([^&]*)/i',$path,$regs)){ 
$searchengine = 'CT114'; 
$keywords = urldecode($regs[1]); // ct114 
}elseif(strpos($domain,'iask.com')!==false && preg_match('/k=([^&]*)/i',$path,$regs)){ 
$searchengine = 'IASK'; 
$keywords = urldecode($regs[1]); // iask 
}elseif(strpos($domain,'soso.com')!==false && preg_match('/w=([^&]*)/i',$path,$regs)){ 
$searchengine = 'SOSO'; 
$keywords = urldecode($regs[1]); // soso 
}elseif(strpos($domain, 'sogou.com')!==false && preg_match('/query=([^&]*)/i',$path,$regs)){ 
$searchengine = 'SOGOU'; 
$keywords = urldecode($regs[1]); // sogou 
}elseif(strpos($domain,'so.163.com')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'NETEASE'; 
$keywords = urldecode($regs[1]); // netease 
}elseif(strpos($domain,'yodao.com')!== false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'YODAO'; 
$keywords = urldecode($regs[1]); // yodao 
}elseif(strpos($domain,'zhongsou.com')!==false && preg_match('/word=([^&]*)/i',$path,$regs)){ 
$searchengine = 'ZHONGSOU'; 
$keywords = urldecode($regs[1]); // zhongsou 
}elseif(strpos($domain,'search.tom.com')!==false && preg_match('/w=([^&]*)/i',$path,$regs)){ 
$searchengine = 'TOM'; 
$keywords = urldecode($regs[1]); // tom 
}elseif(strpos($domain,'live.com')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'MSLIVE'; 
$keywords = urldecode($regs[1]); // MSLIVE 
}elseif(strpos($domain, 'tw.search.yahoo.com')!==false && preg_match('/p=([^&]*)/i',$path,$regs)){ 
$searchengine = 'YAHOO TAIWAN'; 
$keywords = urldecode($regs[1]); // yahoo taiwan 
}elseif(strpos($domain,'cn.yahoo.')!==false && preg_match('/p=([^&]*)/i',$path,$regs)){ 
$searchengine = 'YAHOO CHINA'; 
$keywords = urldecode($regs[1]); // yahoo china 
}elseif(strpos($domain,'yahoo.')!==false && preg_match('/p=([^&]*)/i',$path,$regs)){ 
$searchengine = 'YAHOO'; 
$keywords = urldecode($regs[1]); // yahoo 
}elseif(strpos($domain,'msn.com.tw')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'MSN TAIWAN'; 
$keywords = urldecode($regs[1]); // msn taiwan 
}elseif(strpos($domain,'msn.com.cn')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'MSN CHINA'; 
$keywords = urldecode($regs[1]); // msn china 
}elseif(strpos($domain,'msn.com')!==false && preg_match('/q=([^&]*)/i',$path,$regs)){ 
$searchengine = 'MSN'; 
$keywords = urldecode($regs[1]); // msn 
} 
return $keywords; 
}