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

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

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