原来图片服务器采用Windows .net架构，鉴于需求需要生成各种尺寸图片。
流程说明:
用户从Nginx请求对应的图片,判断是否存在_200x300的对应参数，如果没有就直接请求到对应目录的原图，否则继续判断是否在本地已经生成了对应的缓存图片，如果存在返回已经生成过的定制尺寸图片，否则请求PHP动态生成。
Nginx部分配置:
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server {
listen 80;
server_name pics.abc.com;
location / {
root
/var/www/html
;
index index.html index.htm index.php;
error_page 500 502 503 504
/50x
.html;
location =
/50x
.html {
root html;
}
location ~ \_(\d+)x(\d+)\.(jpg|png|gif|jpeg|bmp)$ {
//
判断是否定制图
try_files $uri
/temp/
$uri
/get
.php;
//
判断是否已生成过定制图否则转交给
/get
.php
expires 30d;
}
location ~ \.php$ {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
location ~ .*\.(gif|jpg|jpeg|png|bmp)$
{
expires 30d;
}
}
}
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在/var/www/html我们以只读方式挂载Windows的目录，修改/etc/fstab,添加
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\\192.168.2.3\f$\pics.abc.com\pics
/var/www/html/pics/
cifs ro,username=user,password=pass 1 2
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然后重启netfs服务，另外执行下面命令，安装依赖的包
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yum -y
install
samba-client cifs-utils
service netfs restart
chkconfig netfs on
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生成的缩率图会放到网站目录的temp目录下，如请求的http://pics.abc.com/pics/201604/29/abc_200x300.jpg
则生成的图片放在temp/pics/201604/29/abc_200x300.jpg目录下
PHP脚本:
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function
thumb(
$src
,
$width
,
$height
,
$filename
,
$mode
=
'scale'
,
$quality
=
'100'
) {
try
{
$imageValue
=
getimagesize
(
$src
);
$sourceWidth
=
$imageValue
[0];
//原图宽
$sourceHeight
=
$imageValue
[1];
//原图高
$thumbWidth
=
$width
;
//缩略图宽
$thumbHeight
=
$height
;
//缩略图高
$_x
= 0;
$_y
= 0;
$w
=
$sourceWidth
;
$h
=
$sourceHeight
;
if
(
$mode
==
'scale'
) {
if
(
$sourceWidth
<=
$thumbWidth
&&
$sourceHeight
<=
$thumbHeight
) {
$_x
=
floor
((
$thumbWidth
-
$sourceWidth
) / 2);
$_y
=
floor
((
$thumbHeight
-
$sourceHeight
) / 2);
$thumbWidth
=
$sourceWidth
;
$thumbHeight
=
$sourceHeight
;
}
else
{
if
(
$thumbHeight
*
$sourceWidth
>
$thumbWidth
*
$sourceHeight
) {
$thumbHeight
=
floor
(
$sourceHeight
*
$width
/
$sourceWidth
);
$_y
=
floor
((
$height
-
$thumbHeight
) / 2);
}
else
{
$thumbWidth
=
floor
(
$sourceWidth
*
$height
/
$sourceHeight
);
$_x
=
floor
((
$width
-
$thumbWidth
) / 2);
}
}
}
else
if
(
$mode
==
'crop'
) {
if
(
$sourceHeight
<
$thumbHeight
) {
//如果原图尺寸小于当前尺寸
$thumbWidth
=
floor
(
$thumbWidth
*
$sourceHeight
/
$thumbHeight
);
$thumbHeight
=
$sourceHeight
;
}
if
(
$sourceWidth
<
$thumbWidth
) {
$thumbHeight
=
floor
(
$thumbHeight
*
$sourceWidth
/
$thumbWidth
);
$thumbWidth
=
$sourceWidth
;
}
$s1
=
$sourceWidth
/
$sourceHeight
;
//原图比例
$s2
=
$width
/
$height
;
//新图比例
if
(
$s1
==
$s2
) {
}
else
if
(
$s1
>
$s2
) {
//全高度
$y
= 0;
$ax
=
floor
(
$sourceWidth
* (
$thumbHeight
/
$sourceHeight
));
$x
= (
$ax
-
$thumbWidth
) / 2;
$w
=
$thumbWidth
/ (
$thumbHeight
/
$sourceHeight
);
}
else
{
//全宽度
$x
= 0;
$ay
=
floor
(
$sourceHeight
* (
$thumbWidth
/
$sourceWidth
));
//模拟原图比例高度
$y
= (
$ay
-
$thumbHeight
) / 2;
$h
=
$thumbHeight
/ (
$thumbWidth
/
$sourceWidth
);
}
}
switch
(
$imageValue
[2]) {
case
2:
$source
= imagecreatefromjpeg(
$src
);
break
;
case
1:
$source
= imagecreatefromgif(
$src
);
break
;
case
3:
$source
= imagecreatefrompng(
$src
);
break
;
case
6:
$source
= imagecreatefromwbmp(
$src
);
break
;
default
: defulat();
return
;
}
header(
"Content-type: image/jpeg"
);
$thumb
= imagecreatetruecolor(
$width
,
$height
);
imagefill(
$thumb
, 0, 0, imagecolorallocate(
$thumb
, 255, 255, 255));
imagecopyresampled(
$thumb
,
$source
, 0, 0,
$x
,
$y
,
$width
,
$height
,
$w
,
$h
);
imagejpeg(
$thumb
, null,
$quality
);
imagejpeg(
$thumb
,
$filename
,
$quality
);
imagedestroy(
$thumb
);
imagedestroy(
$source
);
}
catch
(Exception
$ex
) {
defulat();
}
}
function
defulat() {
/*
$default_img = realpath('../pictures/nopic.gif');
ob_start();
header('Content-type:image/jpeg');
readfile($default_img);
ob_flush();
flush();
*/
echo
'error'
;
}
function
mkDirs(
$dir
){
if
(!
is_dir
(
$dir
)){
if
(!mkDirs(dirname(
$dir
))){
return
false;
}
if
(!
mkdir
(
$dir
,0755)){
return
false;
}
}
return
true;
}
$uri
=
$_SERVER
[
'REQUEST_URI'
];
$image
=
basename
(
$uri
);
$temp
=
'./temp/'
.dirname(
$uri
).
'/'
;
$imgpath
=
'.'
.dirname(
$uri
).
'/'
;
/*
//检查本地是否存在文件，原图
if(file_exists($temp.$image)){
ob_start();
header('Content-type:image/jpeg');
readfile($temp.$image);
ob_flush();
flush();
exit();
}
*/
//检查生成的图片是否曾经生成过，存在即返回，否则重新生成新图
if
(!preg_match(
'/_(\d+)x(\d+)/'
,
$image
,
$wh
)){
ob_start();
header(
'Content-type:image/jpeg'
);
readfile(
$imgpath
.
$image
);
ob_flush();
flush
();
exit
();
}
$width
=
$wh
[1];
$height
=
$wh
[2];
$source_img
=preg_replace(
'/_(\d+)x(\d+)/'
,
''
,
$image
);
//对长宽都超过的图片返回原图
if
(
$width
>=2000 ||
$height
>=2000){
ob_start();
header(
'Content-type:image/jpeg'
);
readfile(
$imgpath
.
$source_img
);
ob_flush();
flush
();
exit
();
}
//图片处理
$src
=
$imgpath
.
$source_img
;
$filename
=
$temp
.
$image
;
mkDirs(
$temp
);
//thumb(realpath($src), $width, $height, $filename, 'crop', '85');
thumb(
realpath
(
$src
),
$width
,
$height
,
$filename
,
'crop'
,
'100'
);
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PHP生成尺寸部分参考<PHP图片自动裁切应付不同尺寸的显示>
如果上述服务器出现问题，则降低的Nginx配置为
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server {
listen 80;
server_name localhost;
access_log logs
/host
.access.log main;
location / {
rewrite ^/(.*)\_(\d+)x(\d+)\.(.*)$ /$host/$1 permanent;
rewrite ^/([0-9a-zA-Z]+)/(.*)$ /$host/$1/$2 permanent;
root html;
index index.html index.htm;
}
}
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本文转自 rong341233 51CTO博客，原文链接:http://blog.51cto.com/fengwan/1769043
