php怎么实现png图片旋转
php实现png图片旋转的方法:
function pic_rotating($degrees,$url){ $srcImg = imagecreatefrompng($url);//获取图片资源 $rotate = imagerotate($srcImg, $degrees, 0);//原图旋转 //获取旋转后的宽高 $srcWidth = imagesx($rotate); $srcHeight = imagesy($rotate); //创建新图 $newImg = imagecreatetruecolor($srcWidth, $srcHeight); //分配颜色 + alpha,将颜色填充到新图上 $alpha = imagecolorallocatealpha($newImg, 0, 0, 0, 127); imagefill($newImg, 0, 0, $alpha); //将源图拷贝到新图上,并设置在保存 PNG 图像时保存完整的 alpha 通道信息 imagecopyresampled($newImg, $rotate, 0, 0, 0, 0, $srcWidth, $srcHeight, $srcWidth, $srcHeight); imagesavealpha($newImg, true); //生成新图 imagepng($newImg, $url); } $degrees = 90;//旋转角度 $url = './111111111111/154020404057861.png';//图片存放位置 pic_rotating($degrees,$url);
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