Google Chart

$qr_text = "https://chart.googleapis.com/chart?chs=300x300&cht=qr&chl=" . $ticket_no . "&choe=UTF-8";


$qr_text = "https://zxing.org/w/chart?chs=300x300&cht=qr&chl=" . $ticket_no . "&choe=UTF-8"; // recommended by google chart


$qr_text  = "https://api.qrserver.com/v1/create-qr-code/?size=150x150&format=png&margin=5&data=".$ticket_no


$qr_text = "https://qrcode.tec-it.com/API/QRCode?data=".$ticket_no;


$qr_text = "https://image-charts.com/chart?chs=300x300&cht=qr&chl=" . $ticket_no . "&choe=UTF-8";




php ref:
https://sourceforge.net/projects/phpqrcode/




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