
我们都知道一个二维码PHP API接口使用phpqrcode.php文件编写很容易就可以写出一个API接口,网页所出现的二维码图像一般都是随内容的增加而增大,
//by www.qzphp.cn static QRcode::png ( $text, $outfile = false, $level = QR_ECLEVEL_L, $size = 3, $margin = 4, $saveandprint = false )
关于上面的QRcode::png()这个函数的参数这里不做多解释,网络搜一下解释的比我详细,我们这里只说一下$size这个参数,这个参数指的是像素大小,意思就是二维码中每个方块的大小,所以$text内容越多图片越大,我想要一个固定的png图像尺寸大小,怎么办?
不多扯了,直接修改phpqrcode.php,首先修改文件最下面的encodePNG()方法,把
//by www.qzphp.cn QRimage::png($tab, $outfile, min(max(1, $this->size), $maxSize), $this->margin,$saveandprint);
改为
//by www.qzphp.cn QRimage::png($tab, $outfile, $this->size, $this->margin,$saveandprint);
完整代码:
//by www.qzphp.cn
public function encodePNG($intext, $outfile = false,$saveandprint=false)
{
try {
ob_start();
$tab = $this->encode($intext);
$err = ob_get_contents();
ob_end_clean();
if ($err != '')
QRtools::log($outfile, $err);
$maxSize = (int)(QR_PNG_MAXIMUM_SIZE / (count($tab)+2*$this->margin));
//QRimage::png($tab, $outfile, min(max(1, $this->size), $maxSize), $this->margin,$saveandprint);
QRimage::png($tab, $outfile, $this->size , $this->margin,$saveandprint);//修改内容
} catch (Exception $e) {
QRtools::log($outfile, $e->getMessage());
}
}然后修改private static function image($frame, $pixelPerPoint = 4, $outerFrame = 4)方法,自己搜索找到位置,将
//by www.qzphp.cn $target_image =ImageCreate($imgW * $pixelPerPoint, $imgH * $pixelPerPoint); ImageCopyResized($target_image, $base_image, 0, 0, 0, 0, $imgW * $pixelPerPoint, $imgH * $pixelPerPoint, $imgW, $imgH);
改为
//by www.qzphp.cn $target_image =ImageCreate( $pixelPerPoint, $pixelPerPoint); ImageCopyResized($target_image, $base_image, 0, 0, 0, 0, $pixelPerPoint, $pixelPerPoint, $imgW, $imgH);
好了这样指定$size=200,就会输出200X200的图像了,但是我发现生成的图片白色边框参数$margin也不是指的具体像素,好吧,继续修改。
还是private static function image()函数,最终完整代码如下
//by www.qzphp.cn
private static function image($frame, $pixelPerPoint = 4, $outerFrame = 4)
{
$h = count($frame);
$w = strlen($frame[0]);
$imgW = $w;// + 2*$outerFrame; 修改
$imgH = $h;// + 2*$outerFrame; 修改
$base_image =ImageCreate($imgW, $imgH);
$col[0] = ImageColorAllocate($base_image,255,255,255);
$col[1] = ImageColorAllocate($base_image,0,0,0);
imagefill($base_image, 0, 0, $col[0]);
for($y=0; $y<$h; $y++) {
for($x=0; $x<$w; $x++) {
if ($frame[$y][$x] == '1') {
ImageSetPixel($base_image,$x,$y,$col[1]);
}
}
}
$target_image =ImageCreate( $pixelPerPoint-$outerFrame*2, $pixelPerPoint-$outerFrame*2);//修改
ImageCopyResized($target_image, $base_image, 0, 0, 0, 0, $pixelPerPoint-$outerFrame*2, $pixelPerPoint-$outerFrame*2, $imgW, $imgH);//修改
ImageDestroy($base_image);
//添加----
$iowen_image =ImageCreate( $pixelPerPoint, $pixelPerPoint);
ImageColorAllocate($iowen_image,255,255,255);
imagecopy ( $iowen_image, $target_image, $outerFrame , $outerFrame , 0, 0, $pixelPerPoint-$outerFrame*2, $pixelPerPoint-$outerFrame*2 );
ImageDestroy($target_image);
return $iowen_image;
}完成,现在就可以随意定义边框10px,大小200px的图像了。

