Problems related to getting search keywords in PHP_PHP tutorial

Problem with PHP getting search keywords

I found a piece of code on the Internet to get the search key words. I tested a key word but couldn't get it. Is the code invalid or is there a BUG?

//Get the search source key word

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']:'';//Get the inbound url.

　$search_1="google.com.hk"; //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

　$search_8="so.com"; //q= utf8

　$google=preg_match("/b{$search_1}b/",$url);//Record the matching situation for inbound judgment.

$baidu=preg_match("/b{$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);

　$so=preg_match("/b{$search_8}b/",$url);

　$s_s_keyword="";

// $bul=$_SERVER['HTTP_REFERER'];

$bul=$_REQUEST["comelink"];

//Get domain name without parameters

preg_match('@^(?:http://)?([^/]+)@i',$bul,$matches);

　$burl=$matches[1];

// Matching domain name settings

$curl="www.hcyf07.com";

　if($burl!=$curl){

　if ($google)

　{//From google

　$s_s_keyword=get_keyword($url,'q=');//The character before the keyword is "q=".

$s_s_keyword=urldecode($s_s_keyword);

$urlname="Google:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

　}

else if($baidu)

　{//From Baidu

　$s_s_keyword=get_keyword($url,'wd=');//The character before the keyword is "wd=".

$s_s_keyword=urldecode($s_s_keyword);

　$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Baidu:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($yahoo)

　{//From Yahoo

　$s_s_keyword=get_keyword($url,'q=');//The character before the keyword is "q=".

$s_s_keyword=urldecode($s_s_keyword);

　//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Yahoo:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($sogou)

　{//From Sogou

　$s_s_keyword=get_keyword($url,'query=');//The character before the keyword is "query=".

$s_s_keyword=urldecode($s_s_keyword);

　$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Sogou:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($soso)

　{//From Soso

　$s_s_keyword=get_keyword($url,'w=');//The character before the keyword is "w=".

$s_s_keyword=urldecode($s_s_keyword);

　$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Soso:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($bing)

　{//From Bing

　$s_s_keyword=get_keyword($url,'q=');//The character before the keyword is "q=".

$s_s_keyword=urldecode($s_s_keyword);

　//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Bing:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($so)

　{//from 360

　$s_s_keyword=get_keyword($url,'q=');//The character before the keyword is "q=".

$s_s_keyword=urldecode($s_s_keyword);

　//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="360：";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else if($youdao)

　{//From Youdao

　$s_s_keyword=get_keyword($url,'q=');//The character before the keyword is "q=".

$s_s_keyword=urldecode($s_s_keyword);

　//$s_s_keyword=iconv("GBK","UTF-8",$s_s_keyword);//The engine is gbk

$urlname="Youdao:";

　$_SESSION["urlname"]=$urlname;

　$_SESSION["s_s_keyword"]=$s_s_keyword;

　}

else{

// $urlname=$burl;

$urlname="Direct access";

　$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"];

　}

　------Solution--------------------

Are there any error messages?

　------Solution--------------------

Your code was written more than N years ago.

　$_SERVER['HTTP_REFERER'] cannot obtain https:// website.

Now for security reasons, almost all search engines use https:// instead of http://.

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