imagemagick根据请求生成大小缩略图

来源：互联网发布：无锡华云数据工资待遇编辑：程序博客网时间：2024/05/16 07:45

安装JPG,PNG开发包

apt-get install libjpeg62-dev libpng12-dev libtiff4-dev

安装ImageMagick和imagick

tar zxvf ImageMagick.tar.gz   cd ImageMagick-6.5.1-2/   ./configure   make   make install   cd ../     tar zxvf imagick-2.3.0.tgz   cd imagick-2.3.0/   /usr/local/webserver/php/bin/phpize   ./configure --with-php-config=/usr/local/webserver/php/bin/php-config   make   make install   cd ../

如果：no decode delegate for this image format
安装：apt-get install libjpeg62-dev libpng12-dev libtiff4-dev后再重新安装ImageMagick和imagick

如果：libMagickCore.so.5: cannot open shared object file
执行命令：ldconfig /usr/local/lib

修改php.ini
extension = "imagick.so"

重启php-fpm
/etc/init.d/php5-fpm restart

增加rewrite
rewrite ^/uploads/(.*)\.(.*)$ /img.php last;

重启nignx
nginx -s reload

增加img.php代码处理

<?php       /*        A  thumbnail creation.  */        /* Create the Imagick object */  $img = $_SERVER['REQUEST_URI'];       define('DEDEROOT', str_replace("\\", '/', dirname(__FILE__) ) );preg_match("/(.*)_(\d+)_(\d+)\.(\w+)/is",$img,$match);   $getWidth = $match[2];  $getHeight = $match[3];  $normalImg = DEDEROOT. $match[1].".".$match[4];  $smallImg = DEDEROOT. $match[0];  $im = new Imagick();   if (!$match[4] || !file_exists($normalImg)) {          $normalImg =  DEDEROOT. $img;          if (!file_exists($normalImg)) {                  //没有图片                  header("HTTP/1.1 404 Not Found");                  exit;          }          //使用原图          $im->readImage( $normalImg);          header( "Content-Type: image/{$im->getImageFormat()}" );          echo $im->getImageBlob();          $im->destroy();          exit;  }  /* Read the image file */  $im->readImage( $normalImg);   if ($getWidth && $getHeight) {          $srcWH = $im->getImageGeometry();                       $rate_w  = $getWidth / $srcWH['width'];          $rate_h  = $getHeight / $srcWH['height'];             $rate    = ($rate_w > $rate_h) ? $rate_w : $rate_h;          $rate = $rate > 1 ? 1 : $rate;          $thumb_w = round($srcWH['width'] * $rate);          $thumb_h = round($srcWH['height'] * $rate);          //缩略           $im->thumbnailImage( $thumb_w, $thumb_h );          if ($thumb_w>$getWidth || $thumb_h>$getHeight) {                  $fromX = ($thumb_w-$getWidth)/2;                  //剪切                  $im->cropImage($getWidth, $getHeight,$fromX,0);          }  } elseif ($getWidth && !$getHeight) {          $im->thumbnailImage( $getWidth, null);  } elseif (!$getWidth && $getHeight) {          $im->thumbnailImage(null, $getHeight );  }   /* Write the thumbail to disk */  $im->writeImage($smallImg);      header( "Content-Type: image/{$im->getImageFormat()}" );   echo $im->getImageBlob();     /* Free resources associated to the Imagick object */  $im->destroy();       ?>

优化:

nginx的rewrite时可以做个判断，如果已经有生成的图片则直接显示。不用再到php里处理。

if (!-f $request_filename) {
rewrite ^/uploads/(.*)\.(.*)$ /img.php last;
}

参考：

http://www.digitalsanctum.com/2009/03/18/installing-imagemagick-from-source-on-ubuntu-804/
http://bootpolish.net/home_howto_installimagemagick
http://wenku.baidu.com/view/2e93f278168884868762d689.html
http://apps.hi.baidu.com/share/detail/37348887
http://hi.baidu.com/houwenbin1986/blog/item/a0afa1fa3adcad294e4aea48.html
http://www.zhouchen33.com/index.php/archives/284

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