PHP judgment mobile terminal, PC terminal, WeChat sample code sharing

Here the blogger shared two examples of PHP judgment for everyone. One is PHP judging whether it is a mobile phone or a PC, and the other is PHP judging whether it is a WeChat browser. For your reference, the specific content is as follows
1 , Determine whether it is the mobile version

function isMobile() {
  // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
  if (isset($_SERVER['HTTP_X_WAP_PROFILE'])) {    return true;
  }  // 如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
  if (isset($_SERVER['HTTP_VIA'])) {    // 找不到为flase,否则为true
    return stristr($_SERVER['HTTP_VIA'], "wap") ? true : false;
  }  // 脑残法，判断手机发送的客户端标志,兼容性有待提高。其中'MicroMessenger'是电脑微信
  if (isset($_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','symbian','ucweb','windowsce','palm','operamini','operamobi',    
  'openwave','nexusone','cldc','midp','wap','mobile','MicroMessenger');    
  // 从HTTP_USER_AGENT中查找手机浏览器的关键字
    if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {      
    return true;
    }
  }  // 协议法，因为有可能不准确，放到最后判断
  if (isset ($_SERVER['HTTP_ACCEPT'])) {    // 如果只支持wml并且不支持html那一定是移动设备
    // 如果支持wml和html但是wml在html之前则是移动设备
    if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) && (strpos($_SERVER['HTTP_ACCEPT'], 'text/html') ===    
    false || (strpos($_SERVER[&#39;HTTP_ACCEPT&#39;], &#39;vnd.wap.wml&#39;) < strpos($_SERVER[&#39;HTTP_ACCEPT&#39;], &#39;text/html&#39;)))) {      
    return true;
    }
  }  return false;
}

2. Determine whether it is the WeChat built-in browser

function isWeixin() {
  if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {    return true;
  } else {    return false;
  }
}

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