linux环境下php GD库的安装
1.安装zlib
tar zxvf zlib-1.2.2.tar.gz
cd zlib-1.2.2
./configure
make
make install
2.安装libpng
tar zxvf libpng-1.2.7.tar.tar
cd libpng-1.2.7
cd scripts/
mv makefile.linux ../makefile
cd ..
make
make install
注意，这里的makefile不是用./configure生成，而是直接从scripts/里拷一个
3.安装freetype
tar zxvf freetype-2.1.9.tar.gz
cd freetype-2.1.9
./configure
make
make install
4.安装Jpeg
tar zxvf jpegsrc.v6b.tar.gz
cd jpeg-6b/
./configure –enable-shared
make
make test
make install
注意，这里configure一定要带–enable-shared参数，不然，不会生成共享库
5.安装GD
tar zxvf gd-2.0.33.tar.gz
cd gd-2.0.33
./configure –with-png –with-freetype –with-jpeg
make install
6.重新编译PHP
tar zxvf php-5.2.17tar.gz
cd php-5.2.17
./configure (以前的参数) –with-gd –enable-gd-native-ttf –with-zlib –with-png –with-jpeg –with-freetype –enable-sockets
make
make install
然后编辑php.ini，加入extension=gd.so
重启apache就行了
若还是不成功，那就使用终极大招，把yum源切换成阿里的，然后执行
yum install php-mysql php-gd libjpeg* php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc php-mbstring php-mcrypt php-bcmath php-mhash libmcrypt
重启apache