January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Content preview from PHP编程：第4版
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带文本的图片
｜
253
imagestring($image, 5, 50, 160, "A Black Box", $black);
header("Content-Type: image/png");
imagepng($image);
图
10-3
是示例
10-5
的输出结果。
图10-3：加上文字的黑色正方形
imagestring()
函数用来在图片上添加文本，可指定文本的左上顶点、颜色和字体（
GD
字体标识符）：
imagestring(
image, font_id, x, y, text, color
);
字体
GD
用
ID
来标识字体。它内建了
5
种字体，也可以使用
imageloadfont()
函数来加载其
他字体。
5
种内建字体如图
10-4
所示。
图10-4：GD内建字体
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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.