PHP common authentication / third-party methods

1. Mobile number verification

	function checkMobile(tel) {
	    var reg = /(^1[3|4|5|6|7|8|9][0-9]{9}$)/;
	    if (reg.test(tel)) {
	        return true;
	    }else{
	        return false;
	    };
	}

2. ID card verification

	function isCardNo(card)  {  
	  	 //  The ID number is 15 Bits or 18 position ,15 It's all numbers ,18 Pre position 17 Bits are numbers , The last bit is the check bit , May be a number or character X  
	  	 var reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;  
	   	if(reg.test(card) === false)  	{  
	       		alert(" Illegal ID card input ");  
	       		return  false;  
	   	}  
	}

3. obtain IP Address

	  // Using Baidu API according to IP Search address 
     function get_city($ip=''){
        $url = 'http://api.map.baidu.com/location/ip?ak=940td2x3uADVUx3vdH7aajHC&ip='.$ip.'&coor=bd09ll';
        $ch = curl_init();
	 	curl_setopt($ch, CURLOPT_URL, $url);
	 	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	 	curl_setopt($ch, CURLOPT_HEADER,0);
	 	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
	 	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,false);
	 	$output = curl_exec($ch);
	 	curl_close($ch);
	 	$info = json_decode($output,true);
	 	if($info['status']==0){// success 
	 		return array('code'=>200,'msg'=>' The request is successful ','data'=>$info);
	 	}else{// Failure 
	 		return array('code'=>201,'msg'=>$info['message'],'data'=>$info);
	 	}
	 }