January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Content preview from PHP编程：第4版
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创建和绘制图片
｜
249
imagefilledrectangle(
image
,
tlx
,
tly
,
brx
,
bry
,
color
);
下一步是将适合创建图片内容的类型作为
Content-Type
头信息发送到浏览器，然后，调
用合适的函数来输出。
imagejpeg()
、
imagegif()
、
imagepng()
和
imagewbmp()
方法分
别用于创建
GIF
、
JPEG
、
PNG
和
WBMP
文件
：
imagegif(
image
[,
lename
]);
imagejpeg(
image
[,
lename
[,
quality
]]);
imagepng(
image
[,
lename
]);
imagewbmp(
image
[,
lename
]);
如果没有指定
filename
，图片将会输出到浏览器，否则，会在指定的文件路径创建（或覆盖）
图片。用于表示
JPEG
图片质量的
quality
参数的取值为
0
（外观最差）
到
100
（外观最好）
的数字。质量越低，文件大小越小。默认设置是
75
。
在示例
10-1
中，在调用输出生成函数
imagepng()
前设置了
HTTP
头信息。如果你在脚本
的最开始设置了
Content-Type
头信息，所有生成的错误也将会被当作图片数据，
并且浏览
器会显示一个图片损坏图标。表
10-1
列出了图片格式和它对应的
Content-Type
值。
表 10-1：图片格式对应的 Content-Type 值
格式
Content-Type
GIF image/gif
JPEG ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.