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PHP QR code generation library

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PHP QR code generation library

<?php   
    class QRbitstream {
    
        public $data = array();
        
        //----------------------------------------------------------------------
        public function size()
        {
            return count($this->data);
        }
        
        //----------------------------------------------------------------------
        public function allocate($setLength)
        {
            $this->data = array_fill(0, $setLength, 0);
            return 0;
        }
    
        //----------------------------------------------------------------------
        public static function newFromNum($bits, $num)
        {
            $bstream = new QRbitstream();
            $bstream->allocate($bits);
            
            $mask = 1 << ($bits - 1);
            for($i=0; $i<$bits; $i++) {
                if($num & $mask) {
                    $bstream->data[$i] = 1;
                } else {
                    $bstream->data[$i] = 0;
                }
                $mask = $mask >> 1;
            }
            return $bstream;
        }

This QR code generation library is very easy to use. Of course, your PHP environment must enable GD2 support. This library provides a key png() method, in which the parameter $text indicates the generation of two-digit information text; the parameter $outfile indicates whether to output a QR code image file, the default is no; the parameter $level indicates the fault tolerance rate, that is, there is The covered areas can also be identified, which are L (QR_ECLEVEL_L, 7%), M (QR_ECLEVEL_M, 15%), Q (QR_ECLEVEL_Q, 25%), H (QR_ECLEVEL_H, 30%); the parameter $size indicates the size of the generated image, The default is 3; the parameter $margin indicates the spacing value of the blank area of ??the border around the QR code; the parameter $saveandprint indicates whether to save the QR code and display it.

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