无损压缩图片心得(二)_PHP教程
程序员文章站
2024-04-03 16:57:16
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用户之前在发烧网参加的上传图片活动都没有经过无损压缩处理.想用脚本对一月内传上去的图片进行处理,但Amazon_S3服务集群上只能使用他们提供的一些简单的API.所以只能先down 下来,压缩处理后,再传上去覆盖原来的图片.
经过多次调试,最终写了个php的脚本对之进行处理:详见这里.
代码如下:
1:2: function compress_img ($source) {3: $exts = array("png","bmp","gif","pnm","tiff");4: $start_time = strtotime("-30 day");5: exec("s3cmd ls s3://fever38-us-static/hotdeals/{$source}/ > ./tmp.txt");6: $rs = file('./tmp.txt');7:
8: foreach($rs as $line) {9: $r = array_filter(explode(' ', $line));10: if(!empty($r[0])){11: $r[0] = trim($r[0]);
12: $time = strtotime($r[0]);
13: }
14: if(!empty($time) && $time >= $start_time){15: if(!empty($r[10])){16: $img = trim($r[10]);
17: $path_info = pathinfo($r[10]);
18: $ext = trim($path_info["extension"]);19: $file_name = strtolower(trim($path_info["basename"]));20:
21: exec("s3cmd get ".$img);22: exec("cp {$file_name} /mnt/heisoo/s3/{$source}/");23:
24: if (in_array($ext,$exts)) {25: system("/usr/bin/optipng -o5 ".$file_name);26: }
27: if ($ext == "jpg" || $ext == "jpeg") {28: system("/usr/bin/jpegoptim -o --strip-all ".$file_name);29: }
30: system("s3cmd put {$file_name} {$img} --guess-mime-type --add-header 'Cache-Control:max-age=31536000' --add-header 'Expires: Thu, 01 Dec 2014 16:00:00 GMT' --acl-public");31: unlink($file_name);
32: }
33: }
34: }
35:
36: unlink('./tmp.txt');37: }
38:
39: compress_img("promotion_main_pic");40: compress_img("src_thumb");41: compress_img("uploadImage");42: compress_img("dialog_image");43: compress_img("joinPicture");44: ?>
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