Generate QR using PHP

QR-php.php

class qrcode {
    private $data;
 
    //creating text qr code
    public function text($text){
        $this->data = $text;
    }
 
    //creating code with link mtadata
    public function link($url){
        if (preg_match('/^http:\/\//', $url) || preg_match('/^https:\/\//', $url)) {
            $this->data = $url;
        } else {
            $this->data = '<a href="http://'.$url.'>http://'.$url.'</a>';
        }
    }
 
    //creating code with bookmark metadata
    public function bookmark($title, $url){
        $this->data = "MEBKM:TITLE:".$title.";URL:".$url.";;";
    }
 
    //creating code with email address metadata
    public function email_address($email){
        $this->data = '<a href="mailto:'.$email.'>MAILTO:'.$email.'</a>';
    }
 
    //creating code with email metadata
    public function email($email, $subject, $message){
        $this->data = "MATMSG:TO:".$email.";SUB:".$subject.";BODY:".$message.";;";
    }
 
    //creating code with phone 
    public function phone_number($phone){
        $this->data = "TEL:".$phone;
    }
 
    //creating code with sms metadata
    public function sms($phone, $text){
        $this->data = "SMSTO:".$phone.":".$text;
    }
 
    //creating code with mms metadata
    public function mms($phone, $text){
        $this->data = "MMSTO:".$phone.":".$text;
    }
 
    //creating code with mecard metadata
    public function contact_info($name, $phone, $email, $address){
        $this->data = "MECARD:N:".$name.";ADR:".$address.";TEL:".$phone.";EMAIL:".$email.";;";
    }
 
    //creating code with geo location metadata
    public function geo($lat, $lon, $height){
        $this->data = "GEO:".$lat.",".$lon.",".$height;
    }
 
    //creating code with wifi configuration metadata
    public function wifi($type, $ssid, $pass){
        $this->data = "WIFI:T:".$type.";S".$ssid.";".$pass.";;";
    }
 
    //creating code with i-appli activating meta data
    public function iappli($adf, $cmd, $param){
        $cur = current($param);
        $next = next($param);
        $param_str = "";
        foreach($cur as $key => $val){
            $param_str .= "PARAM:".$val.",".$next[$key].";";
        }
        $this->data = "LAPL:ADFURL:".$adf.";CMD:".$cmd.";".$param_str.";";
    }
 
    //creating code with gif or jpg image, or smf, MFi or ToruCa files as content
    public function content($type, $size, $content){
        $this->data = "CNTS:TYPE:".$type.";LNG:".$size.";BODY:".$content.";;";
    }
 
    //getting image
    public function get_image($size = 150, $EC_level = 'L', $margin = '0'){
        $ch = curl_init();
        $this->data = urlencode($this->data); 
        curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$EC_level.'|'.$margin.'&chl='.$this->data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
 
        $response = curl_exec($ch);
        curl_close($ch);
        return $response;
    }
 
    //getting link for image
    public function get_link($size = 150, $EC_level = 'L', $margin = '0'){
        $this->data = urlencode($this->data); 
        return 'http://chart.apis.google.com/chart?chs='.$size.'x'.$size.'&cht=qr&chld='.$EC_level.'|'.$margin.'&chl='.$this->data;
    }
 
    //forsing image download
    public function download_image($file){
        header('Content-Description: File Transfer');
        header('Content-Type: image/png');
        header('Content-Disposition: attachment; filename=QRcode.png');
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: ' . filesize($file));
        ob_clean();
        flush();
        echo $file;
    }
}