PHP to determine if the current browsing device is a mobile phone

Today see a PHP to determine whether it is a handheld device code,

Function ismobile () {//  If there is http_x_wap_profile it must be a mobile device if  (isset  ($_server[' HTTP_X_WAP_ Profile ']) {return true;}   If VIA information contains WAP, it must be a mobile device, some service associations block the information if  (isset  ($_server[' Http_via ')) {//  cannot be found as flase, Otherwise truereturn stristr ($_server[' Http_via '],  "WAP")  ? true : false;}   Brain residue method, determine the mobile phone to send the client logo, compatibility needs to be improved if  (isset  ($_server[' http_user_agent ')) {$clientkeywords  =  array  (' Nokia ',             ' Sony ',              ' Ericsson ',              ' mot ',              ' Samsung ',             ' HTC ',              ' SGH ',              ' LG ',             ' sharp ',              ' sie-',              ' Philips ',              ' Panasonic ',             ' Alcatel ',              ' Lenovo ',              ' iphone ',              ' ipod ',             ' BlackBerry ',             ' Meizu ',              ' Android ',              ' NetFront ', &NBsp;            ' Symbian ',              ' UCWeb ',              ' windowsce ',             ' palm ',              ' Operamini ',              ' Operamobi ',              ' Openwave ',             ' Nexusone ',             ' CLDC ',              ' MIDP ',              ' WAP ',             ' mobile '          );        //  Find the keywords in the phone browser from http_user_agent         if  (Preg_match ("/("  . implode (' | '),  $ clientkeywords)  .  ")/I",  strtolower ($_server[' http_user_agent '))) {         return true;        }}//  Agreement Law, Because there may be inaccuracies, put to the Last Judgment if  (isset  ($_server[' http_accept ')) {//  if only WML is supported and HTML is not supported that must be a mobile device//  If WML and HTML are supported but WML before HTML is mobile device if  ((Strpos ($_server[' http_accept '],  ' vnd.wap.wml ')  !==  False)  &&  (Strpos ($_server[' http_accept '],  ' text/html ')  === false | |   (Strpos ($_server[' http_accept '],  ' vnd.wap.wml ')  < strpos ($_server[' http_accept '),   ' text/html '))) {return true;}} Return false;}

PHP to determine if the current browsing device is a mobile phone