在使用php处理一些图像时，有时会出现诸如这样的错误：Call to undefined function imagecreate()
这是由于没有安装或是没有开启php的gd库导致的问题。
常规Ubuntu与windows
解决方案：
一、在linux系统（这里用的是Ubuntu系统）下
首先在终端输入下列命令：
sudo apt-get install php5-gd
这样就已经安装完php的gd库了。如果使用的是apache服务器，这时还需重启下服务器：
sudo service apache2 restart
如果是nginx则可用可不用。
二、在windows系统下
打开php安装目录下的php.ini配置文件，找到这一行：
;extension=php_gd2.dll
将这一行前面的;号去掉，然后保存。这样已经开启了gd扩展库。
最后重启下服务器就行了。
编译make安装方法
在编译配置扩展的时候就没加上gd的同学可以参考下面的方法
找到安装php的目录下，重新配置扩展
make clean
./configure --prefix=/png/php/5.6.40 --enable-fpm --with-apxs2=/usr/bin/apxs2 --enable-maintainer-zts -with-mysqli --with-pdo-mysql --with-pdo-sqlite --with-gd
make
make test
make install
./configure --with-gd有了就行，其他的扩展看需求
vim打开php.ini
搜索
#vim命令关键字搜索： (1) 点ESC （2）/“关键字”
/extension=php_gd2.dll
找到这行去掉前面的分号“；”
保存退出，重启nginx，apache2重启apache2
/etc/init.d/httpd restart
index.php查找gd,,,成功！
phpize方法
原因：未安装php的gd库，主要处理图片的库
解决方法：
在已经安装php的情况先，需要对PHP进行扩展，加入gd库
1:进入到php源码里面的gd目录下
cd /usr/src/php-5.5.38/ext/gd/
2：执行phpize (命令在php/bin/目录下)
phpize
3：编译安装
./configure --with-php-config=/usr/local/php5/bin/php-config --with-png-dir --with-freetype-dir --with-jpeg-dir --with-gd
make
make install
会报错，执行下面命令：
yum install libpng
yum install libpng-devel
yum install freetype-devel
此时安装完成后会生成一个gd.so的文件，记住这个路径
ls /usr/local/php5/lib/php/extensions/no-debug-non-zts-20121212/
curl.so gd.so opcache.so pcntl.so pdo_mysql.so
4：修改php的配置文件php.ini将gd.so的路径加入进去，如下加入到最后面就行
vim /usr/local/php5/php.ini
[root@slb03 ~]# tail -1 /usr/local/php5/php.ini
extension=/usr/local/php5/lib/php/extensions/no-debug-non-zts-20121212/gd.so
5：重启apache服务
/etc/init.d/httpd restart
centos安装GD库
采用phpize的方式安装，也不成功
提示Cannot find config.m4.
[root@hotdata gd]# php -i | grep -i --color gd PWD => /usr/include/php/ext/gd _SERVER["PWD"] => /usr/include/php/ext/gd [root@hotdata gd]# yum -y install m4 Loaded plugins: security Setting up Install Process Package m4-1.4.13-5.el6.x86_64 already installed and latest version Nothing to do [root@hotdata gd]# yum -y install autoconf Loaded plugins: security Setting up Install Process Package autoconf-2.63-5.1.el6.noarch already installed and latest version Nothing to do [root@hotdata gd]# /usr/bin/phpize Cannot find config.m4. Make sure that you run '/usr/bin/phpize' in the top level source directory of the module
直接使用yum命令安装不成功，错误信息如下：
主要提示信息为需要安装依赖包，可是我已经安装了
# yum install gd gd-devel php-gd
Loaded plugins: security
Setting up Install Process
Package gd-2.0.35-11.el6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package gd-devel.x86_64 0:2.0.35-11.el6 will be installed
--> Processing Dependency: libpng-devel for package: gd-devel-2.0.35-11.el6.x86_64
--> Processing Dependency: libjpeg-devel for package: gd-devel-2.0.35-11.el6.x86_64
--> Processing Dependency: libXpm-devel for package: gd-devel-2.0.35-11.el6.x86_64
--> Processing Dependency: libX11-devel for package: gd-devel-2.0.35-11.el6.x86_64
--> Processing Dependency: freetype-devel for package: gd-devel-2.0.35-11.el6.x86_64
--> Processing Dependency: fontconfig-devel for package: gd-devel-2.0.35-11.el6.x86_64
---> Package php-gd.x86_64 0:5.4.45-56.el6.art will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.45-56.el6.art for package: php-gd-5.4.45-56.el6.art.x86_64
--> Processing Dependency: libt1.so.5()(64bit) for package: php-gd-5.4.45-56.el6.art.x86_64
--> Running transaction check
---> Package fontconfig-devel.x86_64 0:2.8.0-5.el6 will be installed
---> Package freetype-devel.x86_64 0:2.3.11-17.el6 will be installed
--> Processing Dependency: freetype = 2.3.11-17.el6 for package: freetype-devel-2.3.11-17.el6.x86_64
---> Package libX11-devel.x86_64 0:1.6.4-3.el6 will be installed
--> Processing Dependency: libX11 = 1.6.4-3.el6 for package: libX11-devel-1.6.4-3.el6.x86_64
--> Processing Dependency: pkgconfig(xcb) >= 1.11.1 for package: libX11-devel-1.6.4-3.el6.x86_64
--> Processing Dependency: pkgconfig(xproto) for package: libX11-devel-1.6.4-3.el6.x86_64
--> Processing Dependency: pkgconfig(xcb) for package: libX11-devel-1.6.4-3.el6.x86_64
--> Processing Dependency: pkgconfig(kbproto) for package: libX11-devel-1.6.4-3.el6.x86_64
---> Package libXpm-devel.x86_64 0:3.5.10-2.el6 will be installed
--> Processing Dependency: libXt.so.6()(64bit) for package: libXpm-devel-3.5.10-2.el6.x86_64
---> Package libjpeg-turbo-devel.x86_64 0:1.2.1-3.el6_5 will be installed
---> Package libpng-devel.x86_64 2:1.2.49-2.el6_7 will be installed
---> Package php-gd.x86_64 0:5.4.45-56.el6.art will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.45-56.el6.art for package: php-gd-5.4.45-56.el6.art.x86_64
---> Package t1lib.x86_64 0:5.1.2-6.el6_2.1 will be installed
--> Running transaction check
---> Package freetype.x86_64 0:2.3.11-15.el6_6.1 will be updated
---> Package freetype.x86_64 0:2.3.11-17.el6 will be an update
---> Package libX11.x86_64 0:1.6.0-6.el6 will be updated
---> Package libX11.x86_64 0:1.6.4-3.el6 will be an update
--> Processing Dependency: libX11-common = 1.6.4-3.el6 for package: libX11-1.6.4-3.el6.x86_64
---> Package libXt.x86_64 0:1.1.4-6.1.el6 will be installed
---> Package libxcb-devel.x86_64 0:1.12-4.el6 will be installed
--> Processing Dependency: libxcb = 1.12-4.el6 for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: pkgconfig(xau) >= 0.99.2 for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: libxcb-xkb.so.1()(64bit) for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: libxcb-xinput.so.0()(64bit) for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: libxcb-sync.so.1()(64bit) for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: libxcb-present.so.0()(64bit) for package: libxcb-devel-1.12-4.el6.x86_64
--> Processing Dependency: libxcb-dri3.so.0()(64bit) for package: libxcb-devel-1.12-4.el6.x86_64
---> Package php-gd.x86_64 0:5.4.45-56.el6.art will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.45-56.el6.art for package: php-gd-5.4.45-56.el6.art.x86_64
---> Package xorg-x11-proto-devel.noarch 0:7.7-14.el6 will be installed
--> Running transaction check
---> Package libX11-common.noarch 0:1.6.0-6.el6 will be updated
---> Package libX11-common.noarch 0:1.6.4-3.el6 will be an update
---> Package libXau-devel.x86_64 0:1.0.6-4.el6 will be installed
---> Package libxcb.x86_64 0:1.9.1-3.el6 will be updated
---> Package libxcb.x86_64 0:1.12-4.el6 will be an update
---> Package php-gd.x86_64 0:5.4.45-56.el6.art will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.45-56.el6.art for package: php-gd-5.4.45-56.el6.art.x86_64
--> Finished Dependency Resolution
Error: Package: php-gd-5.4.45-56.el6.art.x86_64 (atomic)
Requires: php-common(x86-64) = 5.4.45-56.el6.art
Installed: php-common-5.6.16-1.el6.remi.x86_64 (@remi-php56)
php-common(x86-64) = 5.6.16-1.el6.remi
Available: php-common-5.3.3-49.el6.x86_64 (base)
php-common(x86-64) = 5.3.3-49.el6
Available: php-common-5.4.45-54.el6.art.x86_64 (atomic)
php-common(x86-64) = 5.4.45-54.el6.art
Available: php-common-5.4.45-56.el6.art.x86_64 (atomic)
php-common(x86-64) = 5.4.45-56.el6.art
Available: php55w-common-5.5.38-1.w6.x86_64 (webtatic)
php-common(x86-64) = 5.5.38-1.w6
Available: php56w-common-5.6.40-1.w6.x86_64 (webtatic)
php-common(x86-64) = 5.6.40-1.w6
Available: php70w-common-7.0.33-1.w6.x86_64 (webtatic)
php-common(x86-64) = 7.0.33-1.w6
Available: php71w-common-7.1.26-1.w6.x86_64 (webtatic)
php-common(x86-64) = 7.1.26-1.w6
Available: php71w-common-7.1.27-1.w6.x86_64 (webtatic)
php-common(x86-64) = 7.1.27-1.w6
Available: php71w-common-7.1.28-1.w6.x86_64 (webtatic)
php-common(x86-64) = 7.1.28-1.w6
Available: php71w-common-7.1.29-1.w6.x86_64 (webtatic)
php-common(x86-64) = 7.1.29-1.w6
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
最后采用这种方式安装成功了
yum install php-gd --enablerepo=remi-php56
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