php如何判斷使用者通過手機wap訪問還是電腦直接存取

最近做一個手機查詢系統，自然就牽扯到了此問題，那我就根據對wap的認識淺談下通過php判斷使用者訪問方式是通過wap訪問還是電腦直接存取。
首先說最根本的解決方案：
手機訪問時，會附帶發送user-agent資訊，這個資訊裡面會有手機號碼資訊，那麼如果能取得手機號碼，則可以肯定是通過手機wap訪問的。但是目前中國移動已經屏蔽了user-agent資訊，所以擷取不到手機號碼。有關係的朋友可以聯絡移動公司，把wap網站伺服器的ip提交給中國移動，加入白名單後即可取得ua資訊。目前中國聯通可以直接取到手機號，對聯通使用者此方案可完美實施。
接下來說我的解決方案：
手機訪問，原理是手機通過移動公司的Proxy 伺服器進行的訪問。那麼我們就可以理解是一台普通電腦使用了Proxy 伺服器。當手機通過Proxy 伺服器訪問的時候，http頭資訊會毫無疑問的包含一個資訊：via。這個資訊提供了有價值的判斷資訊。
例如河南移動取得的via資訊是：
http/1.1 hazz-b-gw001-wap(infox-wisg, huawei technologies)
河南聯通的via資訊是：
zxwap gateway,zte technologies
其他各省的http頭資訊和這個大同小異，判斷是否手機訪問的方案就出來了：擷取http的via資訊字串看是否包含wap字元，如果有則是通過手機訪問。這樣做的結果是沒有人能偽造手機訪問，判斷絕對準確。自然，這樣對於網上流行的手機wap模擬器也做了屏蔽----從根本上屏蔽。
作業碼也很簡單：

代碼如下	複製代碼
// check if wap by xhat function check_wap() { return stristr($_SERVER['HTTP_VIA'],"wap") ? true : false; } // check over

從我查閱的資料來看，目前此方法應該是迄今互連網上準確率最高、最簡單的判斷手機存取方法。

iphone智能手機

為discuz做的iphone版本基本完工，為了方便訪問，直接在首頁對iphone的訪問進行了判斷，然後直接跳轉

使用以上代碼判斷，經測試效果很好。

自己用的一個判斷類，比較全面了

代碼如下

複製代碼

/*  判斷訪問使用者是否為手機111cn.net  //判斷是否屬手機  */  function is_mobile() {   $user_agent = strtolower( $_SERVER['HTTP_USER_AGENT'] );   //echo $user_agent;   $mobile_agents = Array("ipad","wap","android","iphone","sec","sam","ericsson","240x320","acer","acoon","acs-","abacho","ahong","airness","alcatel","amoi","anywhereyougo.com","applewebkit/525","applewebkit/532","asus","audio","au-mic","avantogo","becker","benq","bilbo","bird","blackberry","blazer","bleu","cdm-","compal","coolpad","danger","dbtel","dopod","elaine","eric","etouch","fly ","fly_","fly-","go.web","goodaccess","gradiente","grundig","haier","hedy","hitachi","htc","huawei","hutchison","inno","ipaq","ipod","jbrowser","kddi","kgt","kwc","lenovo","lg","lg2","lg3","lg4","lg5","lg7","lg8","lg9","lg-","lge-","lge9","longcos","maemo","mercator","meridian","micromax","midp","mini","mitsu","mmm","mmp","mobi","mot-","moto","nec-","netfront","newgen","nexian","nf-browser","nintendo","nitro","nokia","nook","novarra","obigo","palm","panasonic","pantech","philips","phone","pg-","playstation","pocket","pt-","qc-","qtek","rover","sagem","sama","samu","sanyo","samsung","sch-","scooter","sec-","sendo","sgh-","sharp","siemens","sie-","softbank","sony","spice","sprint","spv","symbian","tcl-","teleca","telit","tianyu","tim-","toshiba","tsm","up.browser","utec","utstar","verykool","virgin","vk-","voda","voxtel","vx","wellco","wig browser","wii","windows ce","wireless","xda","xde","zte","ben","hai","phili");   $is_mobile = false;   foreach ($mobile_agents as $device) {    if (stristr($user_agent, $device)) {     if( 'ipad' == $device )     {      return $is_mobile;     }     $is_mobile = true;     break;    }   }   return $is_mobile;  }