原理是從url中提取關鍵詞,參數說明:url及關鍵詞前的字符,然后進行處理與來源判斷是那個搜索引擎,這樣保存到數據就就行了,PHP實例代碼如下:

1. <?php 
2. // 
3.  
4. $search_url = isset($_get['url'])?$_get['url']:''; //代表傳入的地址 
5. /*$search_url = urldecode($search_url); 
6. print_r($search_url); 
7. */ 
8.  
9. $config = array( 
10.     "s1"=>array( 
11.         "domain" => "google.com", 
12.         "kw" => "q", 
13.         "charset" => "utf-8" 
14.     ), 
15.     "s3"=>array( 
16.         "domain" => "google.cn", 
17.         "kw" => "q", 
18.         "charset" => "utf-8" 
19.     ), 
20.     "s4"=>array( 
21.         "domain" => "baidu.com", 
22.         "kw" => "wd", 
23.         "charset" => "gbk" 
24.     ), 
25.     "s5"=>array( 
26.         "domain" => "soso.com", 
27.         "kw" => "q", 
28.         "charset" => "utf-8" 
29.     ), 
30.     "s6"=>array( 
31.         "domain" => "yahoo.com", 
32.         "kw" => "q", 
33.         "charset" => "utf-8" 
34.     ), 
35.     "s7"=>array( 
36.         "domain" => "bing.com", 
37.         "kw" => "q", 
38.         "charset" => "utf-8" 
39.     ), 
40.     "s8"=>array( 
41.         "domain" => "sogou.com", 
42.         "kw" => "query", 
43.         "charset" => "gbk" 
44.     ), 
45.     "s9"=>array( 
46.         "domain" => "youdao.com", 
47.         "kw" => "q", 
48.         "charset" => "utf-8" 
49.     ), 
50. ); 
51.  
52. //函數作用：從url中提取關鍵詞。參數說明：url及關鍵詞前的字符。 
53. function get_keyword($url,$kw_start) 
54.  
55. { 
56.     $start = stripos($url,$kw_start); 
57.     $url = substr($url,$start+strlen($kw_start)); 
58.     $start = stripos($url,'&'); 
59.     if ($start>0) 
60.     { 
61.         $start=stripos($url,'&'); 
62.         $s_s_keyword=substr($url,0,$start); 
63.     } 
64.     else  
65.     { 
66.         $s_s_keyword=substr($url,0); 
67.     } 
68.     return $s_s_keyword; 
69. } 
70.  
71. $arr_key = array(); 
72. foreach($config as $item){ 
73.     $sh = preg_match("/b{$item['domain']}b/",$search_url); 
74.     if($sh){ 
75.         $query = $item['kw']."="; 
76.  
77.         $s_s_keyword = get_keyword($search_url,$query); 
78.         $f_skey=urldecode($s_s_keyword); 
79.         if($item['charset']=="utf-8"){ 
80.             $f_skey=iconv( "utf-8","gb2312//ignore",$f_skey); //最終提取的關鍵詞 
81.         } 
82.         $keys = explode(" ",$f_skey); 
83.         $arr_key[$item['domain']] = $keys; 
84.     } 
85. } 
86. echo "<pre>"; 
87. print_r($arr_key); 
88.  
89. ?> 
90. <form action="index.php" method="get"> 
91.     <input name="url" size="80"><button type="submit">go</button> 
92. </form>