How to use php to record keywords that users enter a website through a search engine

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The copy code is as follows:

$rfr = $_ SERVER ['HTTP_REFERER']

/ / if (! $rfr) $rfr=' http://'.$_SERVER['HTTP_HOST'];

If ($rfr)

{

$p=parse_url ($rfr)

Parse_str ($p ['query'], $pa)

$p ['host'] = strtolower ($p [' host'])

$arr_sd_key=array (

'baidu.com'= >' word'

'google.com'= >'Q'

'sina.com.cn'= >' word'

'sohu.com'= >' word'

'msn.com'= >'Q'

'bing.com'= >'Q'

'163.compositional = >'q'

'yahoo.com'= >'p'

);

$keyword=''

$sengine=$p ['host']

Foreach ($arr_sd_key as $se= > $kwd)

{

If (strpos ($p ['host'], $se)! = false)

{

$keyword=$pa [$kwd]

$sengine=$se

Break

}

}

$sql= "insert into visit_log (domain,key_word,ct)"

}

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