/**
* param $source
* param $target
* param $percent float 百分比
* return void
*/
function resize($source, $target, $percent)
{
$sourceInfo = getimagesize($source);
$sourceWidth = $sourceInfo[0];
$sourceHeight = $sourceInfo[1];
$sourceType = $sourceInfo[2];
$sourceMime = $sourceInfo['mime'];
//打开来源图片
switch ($sourceType) {
case 1:
$sourceImg = imagecreatefromgif($source);
break;
case 2:
$sourceImg = imagecreatefromjpeg($source);
break;
case 3:
$sourceImg = imagecreatefrompng($source);
break;
case 18:
$sourceImg = imagecreatefromwebp($source);
break;
default:
echo '格式有误';
exit;
}
$newWidth = $sourceWidth * $percent / 100;
$newHeight = $sourceHeight * $percent / 100;
// 创建新图片
$newImage = imagecreatetruecolor($newWidth, $newHeight);
// 上色
$color = imagecolorallocate($newImage, 255, 255, 255);
// 设置透明色
imagecolortransparent($newImage, $color);
// 填充透明色
imagefill($newImage, 0, 0, $color);
// 将原图$image按照指定的宽高,复制到$new_image指定的宽高大小中
imagecopyresized($newImage, $sourceImg, 0, 0, 0, 0, $newWidth, $newHeight, $sourceWidth, $sourceHeight);
header("content-type:{$sourceMime}");
switch ($sourceType) {
case 1:
imagegif($newImage);
break;
case 2:
imagejpeg($newImage);
break;
case 3:
imagepng($newImage, $target);
break;
case 18:
imagewebp($newImage);
break;
default:
echo '格式有误';
exit;
}
imagedestroy($newImage);
}