PHP实现将上传图片自动缩放到指定分辨率,并保持清晰度封装类示例
本文实例讲述了PHP实现将上传图片自动缩放到指定分辨率,并保持清晰度封装类。分享给大家供大家参考,具体如下:class AutoImage{
private $image;
public function resize($src, $width, $height){
//$src 就是 $_FILES['upload_image_file']['tmp_name']
//$width和$height是指定的分辨率
//如果想按指定比例放缩,可以将$width和$height改为$src的指定比例
$this->image = $src;
$info = getimagesize($src);//获取图片的真实宽、高、类型
if($info == $width && $info == $height){
//如果分辨率一样,直接返回原图
return $src;
}
switch ($info['mime']){
case 'image/jpeg':
header('Content-Type:image/jpeg');
$image_wp = imagecreatetruecolor($width, $height);
$image_src = imagecreatefromjpeg($src);
imagecopyresampled($image_wp, $image_src, 0, 0, 0, 0, $width, $height, $info, $info);
imagedestroy($image_src);
imagejpeg($image_wp,$this->image);
break;
case 'image/png':
header('Content-Type:image/png');
$image_wp = imagecreatetruecolor($width, $height);
$image_src = imagecreatefrompng($src);
imagecopyresampled($image_wp, $image_src, 0, 0, 0, 0, $width, $height, $info, $info);
imagedestroy($image_src);
imagejpeg($image_wp,$this->image);
break;
case 'image/gif':
header('Content-Type:image/gif');
$image_wp = imagecreatetruecolor($width, $height);
$image_src = imagecreatefromgif($src);
imagecopyresampled($image_wp, $image_src, 0, 0, 0, 0, $width, $height, $info, $info);
imagedestroy($image_src);
imagejpeg($image_wp,$this->image);
break;
}
return $this->image;
}
}
希望本文所述对大家PHP程序设计有所帮助。
原文链接:https://blog.csdn.net/ltx06/article/details/81627161
文档来源:http://www.zzvips.com/article/181220.html
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