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问题是脚本编译的php不支持gd，不能生成动态的验证码？
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最终的解决办法是：
1.确定gd，jpeg，png，freetype包都已经安装（基于centos6.7 yum安装）
[root@mcd nginx+php1.9]# rpm -qa | grep jpe
libjpeg-turbo-1.2.1-3.el6_5.x86_64
libjpeg-turbo-1.2.1-1.el6.x86_64
openjpeg-libs-1.3-11.el6.x86_64
libjpeg-turbo-devel-1.2.1-3.el6_5.x86_64
[root@mcd nginx+php1.9]# rpm -qa | grep png
libpng-1.2.49-2.el6_7.x86_64
libpng-devel-1.2.49-2.el6_7.x86_64
libpng-1.2.49-1.el6_2.x86_64
[root@mcd nginx+php1.9]# rpm -qa | grep freetype
freetype-devel-2.3.11-17.el6.x86_64
freetype-2.3.11-17.el6.x86_64
[root@mcd nginx+php1.9]# rpm -qa | grep gd
gdb-gdbserver-7.2-60.el6.x86_64
gdbm-1.8.0-38.el6.x86_64
eggdbus-0.6-3.el6.x86_64
gdm-plugin-smartcard-2.30.4-39.el6.x86_64
gd-devel-2.0.35-11.el6.x86_64
gd-2.0.35-11.el6.x86_64
gdm-2.30.4-39.el6.x86_64
gdb-7.2-60.el6.x86_64
gdm-libs-2.30.4-39.el6.x86_64
gdk-pixbuf2-2.24.1-6.el6_7.x86_64
gdb-7.2-83.el6.x86_64
gdbm-devel-1.8.0-38.el6.x86_64
gdm-plugin-fingerprint-2.30.4-39.el6.x86_64
gdbm-1.8.0-36.el6.x86_64
gdb-gdbserver-7.2-83.el6.x86_64
gdm-user-switch-applet-2.30.4-39.el6.x86_64
gdb-7.2-90.el6.x86_64
php-gd-5.3.3-48.el6_8.x86_64
gdk-pixbuf2-devel-2.24.1-6.el6_7.x86_64
2.编译安装，注意标红的字体
./configure --prefix=/opt/php --with-config-file-path=/opt/php/etc/php5 --with-MySQL=mysqlnd --with-pdo-mysql=mysqlnd --with-iconv-dir --with-zlib --with-libxml-dir --enable-xml --enable-magic-quotes --enable-safe-mode --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-fpm --enable-force-cgi-redirect --enable-mbstring --with-mcrypt --enable-ftp --with-gd--with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --without-pear --with-gettext --with-mime-magic --with-freetype-dir --with-jpeg-dir --with-png-dir
make
make install
3.phpinfo看到结果
| GD Support | enabled |
| GD Version | bundled (2.1.0 compatible) |
| FreeType Support | enabled |
| FreeType Linkage | with freetype |
| FreeType Version | 2.5.0 |
| GIF Read Support | enabled |
| GIF Create Support | enabled |
| JPEG Support | enabled |
| libJPEG Version | 6b |
| PNG Support | enabled |
| libPNG Version | 1.2.49 |
| WBMP Support | enabled |
| XBM Support | enabled |
生成动态码的php页面正常显示
