[已解决]Mac PHP yii CException GD with freetype or imagemagick PHP extensions are required

使用Mac开发PHP，使用Yii framework，但是发现后台使用YII自带的验证码时，无法正常使用，出现：

“CException GD with freetype or imagemagick PHP extensions are required”

缺少gd库，需要重新编译安装php，其过程十分辛苦，经过摸索发现使用brew安装比较方便。

首先安装freetype,jpeg,libpng,gd,zlib

解决的办法如下：

brew rm freetype jpeg libpng gd zlib
brew install freetype jpeg libpng gd zlib
#先删除之前的再安装新的

然后创建链接

brew link --overwrite libpng freetype jpeg
#注意添加overwrite，否则可能会提示冲突

接着安装php

brew install php56
#我这里安装的5.6，你也可以安装其他版本

安装完成之后你应该会看到以下提示信息

To enable PHP in Apache add the following to httpd.conf and restart Apache:
    LoadModule php5_module    /usr/local/opt/php54/libexec/apache2/libphp5.so

The php.ini file can be found in:
    /usr/local/etc/php/5.4/php.ini

✩✩✩✩ PEAR ✩✩✩✩

If PEAR complains about permissions, 'fix' the default PEAR permissions and config:
    chmod -R ug+w /usr/local/Cellar/php54/5.4.33/lib/php
    pear config-set php_ini /usr/local/etc/php/5.4/php.ini

✩✩✩✩ Extensions ✩✩✩✩

If you are having issues with custom extension compiling, ensure that
you are using the brew version, by placing /usr/local/bin before /usr/sbin in your PATH:

      PATH="/usr/local/bin:$PATH"

PHP54 Extensions will always be compiled against this PHP. Please install them
using --without-homebrew-php to enable compiling against system PHP.

✩✩✩✩ PHP CLI ✩✩✩✩

If you wish to swap the PHP you use on the command line, you should add the following to ~/.bashrc,
~/.zshrc, ~/.profile or your shell's equivalent configuration file:

      export PATH="$(brew --prefix homebrew/php/php54)/bin:$PATH"

To have launchd start php54 at login:
    ln -sfv /usr/local/opt/php54/*.plist ~/Library/LaunchAgents
Then to load php54 now:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.php54.plist

环境变量、设置开机启动什么的在此就不作说明了，我们需要做的是将原apache里的libphp5.so路径替换成/usr/local/opt/php56/libexec/apache2/libphp5.so

sudo vim /etc/apache2/httpd.conf
sudo apachectl restart

输出phpinfo()，gd库已安装成功，大功告成！

参考：

http://www.fieryrain.com/blog/mac_php_gd

http://www.xiaoxiangzi.com/Programme/PHP/2599.html

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