为WordPress开启Nginx缩略图功能，七牛从此陌路

[root@Mars_Server ~]# /usr/local/nginx/sbin/nginx -V
Tengine version: Tengine/2.1.0 (nginx/1.6.2)
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) 
TLS SNI support enabled
configure arguments: --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_gzip_static_module --with-http_concat_module --with-http_image_filter_module
loaded modules:
    ngx_core_module (static)
    ngx_errlog_module (static)
    ....

--with-http_image_filter_module

#resize裁剪模式配置
location ~* /(.+)-resize(d+)x(d+).(jpg|gif|png)$ {
            set $width $2;
            set $height $3;
            #带长宽的图片实际是不存在的，所以重写到真实图片上
            rewrite /(.+)-resize(d+)x(d+).(jpg|gif|png)$ /$1.$4 break;
            #生成缩略图
            image_filter resize $width $height;
            image_filter_buffer 2M;
            image_filter_jpeg_quality 80;
            image_filter_transparency on;
            #插入一个头部，测试中证明缩略图来自Nginx，测试无误可随时删除
            add_header Thumbnail "By Nginx";
            #如果找不到图片，将返回如下预设图片(请放置正确的图片)
            try_files /$1.$4  /wp-content/uploads/files/notfound.jpg;
        }
 
#crop裁剪模式配置
location ~* /(.+)-crop(d+)x(d+).(jpg|gif|png)$ {
            set $width $2;
            set $height $3;
            #带长宽的图片实际是不存在的，所以重写到真实图片上
            rewrite /(.+)-crop(d+)x(d+).(jpg|gif|png)$ /$1.$4 break;
            #生成缩略图
            image_filter crop $width $height;
            image_filter_buffer 2M;
            image_filter_jpeg_quality 80;
            image_filter_transparency on;
            #插入一个头部，测试中证明缩略图来自Nginx，测试无误可随时删除
            add_header Thumbnail "By Nginx";
            #如果找不到图片，将返回如下预设图片(请放置正确的图片)
            try_files /$1.$4  /wp-content/uploads/files/notfound.jpg;
        }

/usr/local/nginx/sbin/nginx -s reload

location ~ .*.(gif|jpg|jpeg|png|bmp)$ {
            set $width '';
            set $height '';
            #将参数赋值给宽和高
            set $width $arg_width;
            set $height $arg_height;
            #当存在参数请求（即请求的是缩略图），插入头部标识方便测试
            if ( $width != '' ) {
                add_header Thumbnail "By Nginx";
            }
            #当未设置高度时，仅使用宽度来进行缩放，可以保证图片的正常比例（适用于文章）
            if ( $height = '' ) {
                set $height '-';
            }
            #当请求的是原图时（即不带参数），则设置宽高维度为”-”
            if ( $width = '' ) {
                set $width '-';
                set $height '-';
            }
            #生成缩略图
            image_filter resize $width $height;
            image_filter_buffer 2M;
            image_filter_jpeg_quality 80;
            image_filter_transparency on;
}

//文章缩略图及修改图片alt和标题属性函数（已删除其他多余代码）For URL形式①
add_filter ('the_content', 'content_thumbnail');
function content_thumbnail($content) {
        $pattern ="/<img(.*?)src=('|")(.*?).(bmp|gif|jpeg|jpg|png)('|") alt="(.*?)"(.*?)>/i";
        //注释之前文章页面的七牛缩略图关键代码：
        //$replacement2 = '<img$1src=$2$3.$4?imageMogr2/thumbnail/380x$5 alt="'.$post->post_title.'" tilte="'.$post->post_title.'"$7>';
        //改成如下即可，代码为480大小(resize模式)
        $replacement = '<img$1src=$2$3-resize480x480.$4$5 alt="'.$post->post_title.'" tilte="'.$post->post_title.'"$7>';
        //排除不需要缩略图的文章（通过给图片设置nosuolvetu的alt属性）
        if(!preg_match_all('/nosuolvetu/i',$content,$matches)) {
            $content = preg_replace($pattern, $replacement, $content);
        }
     return $content;
}

//文章缩略图及修改图片alt和标题属性函数（已删除其他多余代码）For URL形式②
add_filter ('the_content', 'content_thumbnail');
function content_thumbnail($content) {
        $pattern ="/<img(.*?)src=('|")(.*?).(bmp|gif|jpeg|jpg|png)('|") alt="(.*?)"(.*?)>/i";
        //注释之前文章页面的七牛缩略图关键代码：
        //$replacement2 = '<img$1src=$2$3.$4?imageMogr2/thumbnail/380x$5 alt="'.$post->post_title.'" tilte="'.$post->post_title.'"$7>';
        #改成如下即可
        $replacement = '<img$1src=$2$3.$4?width=480&height=480$5 alt="'.$post->post_title.'" tilte="'.$post->post_title.'"$7>';
        //排除不需要缩略图的文章（通过给图片设置nosuolvetu的alt属性）
        if(!preg_match_all('/nosuolvetu/i',$content,$matches)) {
            $content = preg_replace($pattern, $replacement, $content);
        }
        //去掉原有的图片大小定义，避免图片模糊
        $content = preg_replace('/<img(.*?)width="(.*?)" height="(.*?)"(.*?)>/i', '<img$1$4>', $content);
     return $content;
}