phpPHP创建创建jpg格式图片以及压缩图片(转)

1

bool imagejpeg (resource image [,string filename [,int quality]] )

1

<?

2

Header(

"Content-type: image/jpeg"

);

3

$im

=imagecreatefromjpeg(

"./test.jpg"

);

4

Imagejpeg(

$im

,

''

,20);

5

ImageDestroy(

$im

);

6

?>

01

<?php

02

//图片的质量参数

03

$quality

=70;

04

05

if

(isset(

$_FILES

[

'watermarkee'

]) &&

$_FILES

[

'watermarkee'

][

'error'

]==0)\

06

{

07

$original

=

$_FILES

[

'watermarkee'

][

'tmp_name'

];

08

//创建原始图片

09

$resultImage

=imagecreatefromjpeg(

$original

);

10

11

//定义生成的图片的名字

12

$target_name

=

date

(

'YmdHis'

).

'_'

.preg_replace(

'`[^a-z0-9-_.]`i'

,

''

,

$_FILES

[

'watermarkee'

][

'name'

]);

13

$target

=dirname(

__FILE__

).

'/results/'

.

$target_name

;

14

15

//生成新图片

16

imagejpeg(

$resultImage

,

$target

,

$quality

);

17

}

18

?>

01

$_FILES

[

'userfile'

][

'name'

]

02

//客户端机器文件的原名称

03

04

$_FILES

[

'userfile'

][

'type'

]

05

//文件的 MIME 类型，如果浏览器提供此信息的话。一个例子是“image/gif”。不过此 MIME 类型在 PHP 端并不检查，因此不要想当然认为有这个值

06

07

$_FILES

[

'userfile'

][

'size'

]

08

//已上传文件的大小，单位为字节

09

10

$_FILES

[

'userfile'

][

'tmp_name'

]

11

//文件被上传后在服务端储存的临时文件名

12

13

$_FILES

[

'userfile'

][

'error'

]

14

15

$_FILES

[

'userfile'

][

'tmp_name'

]

16

//临时文件已经可以作为有效的jpeg文件进行处理了。但最终通过image一系列函数处理的图像，最终的存储是要移动至目标目录的

17

18

imagecreatefromjpeg(

$_FILES

[

'userfile'

][

'tmp_name'

])

//即可生成有效的image资源

01

<?php

02

//保存文件缩略图

03

function

thumbnail(

$filename

,

$newWidth

,

$imgName

)

04

{

05

list (

$width

,

$height

) =

getimagesize

(

$filename

);

06

$newHeight

=

$height

/(

$width

/

$newWidth

);

07

$newImage

=imagecreatetruecolor (

$newWidth

,

$newHeight

);

08

$oldImage

=imagecreatefromjpeg (

$filename

);

09

imagecopyresampled (

$newImage

,

$oldImage

,0,0,0,0,

$newWidth

,

$newHeight

,

$width

,

$height

);

10

11

//输出jpeg图像

12

header (

'Content-type: image/jpeg'

);

13

imagejpeg (

$newImage

,

$imgName

,99 );

14

//imagedestroy ($filename );  //若不用于显示则不用该方法。

15

}

16

17

//jpg文件上传并显示缩略图

18

function

uploadImageFiles()

19

{

20

$uploaddir

=

getcwd

() .

"/uploads/"

;

21

$uploadfile

=

$uploaddir

.

$_FILES

[

"upfile"

] [

"name"

];

22

//global $uploadfile;

23

if

(

$_FILES

[

"upfile"

] [

"size"

] > 5000000)

24

{

25

echo

"<script language='javascript'>alert('上传文件不得大于5M!');history.go(-1)</script>"

;

26

}

27

else

28

{

29

if

(

$_FILES

[

"upfile"

] [

"type"

] !=

"image/gif"

and

$_FILES

[

"upfile"

] [

"type"

] !=

"image/pjpeg"

)

30

{

31

echo

"<script language='javascript'>alert('上传文件类型必须是gif/jpeg/jpg格式！');history.go(-1)</script>"

;

32

}

33

else

34

{

35

$this

->thumbnail (

$_FILES

[

"upfile"

][

"tmp_name"

],100,

$uploaddir

.

"miniImg/"

.

$_FILES

[

"upfile"

][

"name"

] );

36

if

(move_uploaded_file (

$_FILES

[

"upfile"

] [

"tmp_name"

],

$uploadfile

))

37

{

38

echo

"文件上传成功。"

;

39

echo

"<img src=\"uploads/miniImg/"

.

$_FILES

[

"upfile"

] [

"name"

] .

"\"/>"

;

40

}

41

}

42

}

43

}

44

?>