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需求

If you have the GD library (available at » http://www.libgd.org/) you will also be able to create and manipulate images.

The format of images you are able to manipulate depend on the version of GD you install, and any other libraries GD might need to access those image formats. Versions of GD older than gd-1.6 support GIF format images, and do not support PNG, where versions greater than gd-1.6 and less than gd-2.0.28 support PNG, not GIF. GIF support was re-enabled in gd-2.0.28.

Note: Since PHP 4.3 there is a bundled version of the GD lib. This bundled version has some additional features like alpha blending, and should be used in preference to the external library since its codebase is better maintained and more stable.

Note: Support for GD 1.x has been removed as of PHP 6.0.0, which requires GD 2.0.33 or later.

You may wish to enhance GD to handle more image formats.

Supported image formats
Image format Library to download Notes
gif   Only supported in GD versions older than gd-1.6 and newer than gd-2.0.28. Read-only GIF support is available with PHP 4.3.0 and the bundled GD-library. Write support is available since PHP 4.3.9 and PHP 5.0.1.
jpeg-6b » ftp://ftp.uu.net/graphics/jpeg/ When building the jpeg-v6b library (prior to building PHP) you must use the --enable-shared option in the configure step. If you do not, you will receive an error saying libjpeg.(a|so) not found when you get to the configure step of building PHP.
png » http://www.libpng.org/pub/png/libpng.html Only supported in GD versions greater than gd-1.6.
xpm » ftp://metalab.unc.edu/pub/Linux/libs/X/!INDEX.html It's likely you have this library already available, if your system has an installed X-Environment.

You may wish to enhance GD to deal with different fonts. The following font libraries are supported:

Supported font libraries
Font library Download Notes
FreeType 1.x » http://www.freetype.org/ Support removed as of PHP 6.0.0
FreeType 2 » http://www.freetype.org/  
T1lib » ftp://sunsite.unc.edu/pub/Linux/libs/graphics/) Support for Postscript Type 1 fonts.


安装/配置
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程