CentOS下php安装mcrypt扩展
（以下步骤均为本人实际操作，可能与你的安装方法有所区别，但我会尽量排除疑惑）
大致步骤（1）安装mcrypt，（2）安装php对mcrypt的扩展，（3）重启apache
（1）、确认你的linux没有安装mcrypt库，如果已安装，跳过安装步骤
[root@test-<span style="color: #800080;">206</span> ~]# yum list installed|<span style="color: #0000ff;">grep</span><span style="color: #000000;"> mcrypt libmcrypt.x86_64 </span><span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span><span style="color: #000000;">.el5.centos installed libmcrypt</span>-devel.x86_64 <span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span><span style="color: #000000;">.el5.centos installed mcrypt.x86_64 </span><span style="color: #800080;">2.6</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">1</span>.el5 installed
以上显示已经安装过，若没有，则按以下两种方式安装
（方法一）yum命令懒人安装
yum <span style="color: #0000ff;">install</span> libmcrypt libmcrypt-devel mcrypt mhash
执行后会显示即将安装的相关库，你可以根据你的linux限定x86_64或者i386，如yum install libmcrypt.x86_64（如果yum命令无法连接仓库，请检查你的/etc/yum.repos.d/里的文件正确性，以及你的/etc/host是不是可达里面的域名）
<span style="color: #000000;">Dependencies Resolved </span>================================================================================<span style="color: #000000;"> Package Arch Version Repository Size </span>================================================================================<span style="color: #000000;"> Installing: libmcrypt i386 </span><span style="color: #800080;">2.5</span>.<span style="color: #800080;">7</span>-<span style="color: #800080;">5</span>.el5 epel <span style="color: #800080;">124</span><span style="color: #000000;"> k libmcrypt x86_64 </span><span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span>.el5.centos extras <span style="color: #800080;">105</span><span style="color: #000000;"> k libmcrypt</span>-devel i386 <span style="color: #800080;">2.5</span>.<span style="color: #800080;">7</span>-<span style="color: #800080;">5</span>.el5 epel <span style="color: #800080;">103</span><span style="color: #000000;"> k libmcrypt</span>-devel x86_64 <span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span>.el5.centos extras <span style="color: #800080;">10</span><span style="color: #000000;"> k mcrypt x86_64 </span><span style="color: #800080;">2.6</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">1</span>.el5 epel <span style="color: #800080;">88</span><span style="color: #000000;"> k mhash i386 </span><span style="color: #800080;">0.9</span>.<span style="color: #800080;">2</span>-<span style="color: #800080;">6</span>.el5 epel <span style="color: #800080;">141</span><span style="color: #000000;"> k mhash x86_64 </span><span style="color: #800080;">0.9</span>.<span style="color: #800080;">9</span>-<span style="color: #800080;">1</span>.el5.rf rpmforge <span style="color: #800080;">161</span><span style="color: #000000;"> k Transaction Summary </span>================================================================================<span style="color: #000000;"> Install </span><span style="color: #800080;">7</span><span style="color: #000000;"> Package(s) Upgrade </span><span style="color: #800080;">0</span><span style="color: #000000;"> Package(s) Total download size: </span><span style="color: #800080;">731</span><span style="color: #000000;"> k Is this ok [y</span>/N]:
确定安装，最后显示
<span style="color: #000000;">Installed: libmcrypt.x86_64 </span><span style="color: #800080;">0</span>:<span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span><span style="color: #000000;">.el5.centos libmcrypt</span>-devel.x86_64 <span style="color: #800080;">0</span>:<span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">4</span><span style="color: #000000;">.el5.centos mcrypt.x86_64 </span><span style="color: #800080;">0</span>:<span style="color: #800080;">2.6</span>.<span style="color: #800080;">8</span>-<span style="color: #800080;">1</span><span style="color: #000000;">.el5 mhash.x86_64 </span><span style="color: #800080;">0</span>:<span style="color: #800080;">0.9</span>.<span style="color: #800080;">9</span>-<span style="color: #800080;">1</span><span style="color: #000000;">.el5.rf Complete</span>!
（方法二）源码编译安装，去http://www.sourceforge.net下载Libmcrypt,mhash,mcrypt安装包
libmcrypt(libmcrypt-2.5.8.tar.gz )：
mcrypt(mcrypt-2.6.8.tar.gz ):
mhash(mhash-0.9.9.9.tar.gz ):
2 .先安装Libmcrypt
#<span style="color: #0000ff;">tar</span> -zxvf libmcrypt-<span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span>.<span style="color: #0000ff;">tar</span><span style="color: #000000;">.gz #cd libmcrypt</span>-<span style="color: #800080;">2.5</span>.<span style="color: #800080;">8</span><span style="color: #000000;"> #.</span>/<span style="color: #000000;">configure #</span><span style="color: #0000ff;">make</span><span style="color: #000000;"> #</span><span style="color: #0000ff;">make</span> <span style="color: #0000ff;">install</span> 说明：libmcript默认安装在/usr/local
3.安装mhash
#<span style="color: #0000ff;">tar</span> -zxvf mhash-<span style="color: #800080;">0.9</span>.<span style="color: #800080;">9.9</span>.<span style="color: #0000ff;">tar</span><span style="color: #000000;">.gz #cd mhash</span>-<span style="color: #800080;">0.9</span>.<span style="color: #800080;">9.9</span><span style="color: #000000;"> #.</span>/<span style="color: #000000;">configure #</span><span style="color: #0000ff;">make</span><span style="color: #000000;"> #</span><span style="color: #0000ff;">make</span> <span style="color: #0000ff;">install</span>
4.安装mcrypt
#<span style="color: #0000ff;">tar</span> -zxvf mcrypt-<span style="color: #800080;">2.6</span>.<span style="color: #800080;">8</span>.<span style="color: #0000ff;">tar</span><span style="color: #000000;">.gz #cd mcrypt</span>-<span style="color: #800080;">2.6</span>.<span style="color: #800080;">8</span><span style="color: #000000;"> #LD_LIBRARY_PATH</span>=/usr/local/lib ./<span style="color: #000000;">configure #</span><span style="color: #0000ff;">make</span><span style="color: #000000;"> #</span><span style="color: #0000ff;">make</span> <span style="color: #0000ff;">install</span>
最后，还是检查下，是否安装成功
（2）、安装php的mcrypt扩展(动态加载编译)
下载php下的mcrypt扩展或者直接下载php的完整安装包
http://cn.php.net/releases/ 网页下找到自己服务器的php版本，下载后tar解压（本人的是php5.3.3）
进入ext/mcrypt文件夹
[root@*_* <span style="color: #800080;">14</span>:<span style="color: #800080;">45</span> ~]# cd php-<span style="color: #800080;">5.3</span>.<span style="color: #800080;">3</span>/ext/mcrypt/
执行phpize命令（phpize是用来扩展php扩展模块的，通过phpize可以建立php的外挂模块，如果没有？yum install php53-devel里包含了，或者其他方法）
[root@*_* <span style="color: #800080;">14</span>:<span style="color: #800080;">48</span> mcrypt]# <span style="color: #0000ff;">whereis</span><span style="color: #000000;"> phpize //为了确定phpize存在 phpize: </span>/usr/bin/phpize /usr/share/<span style="color: #0000ff;">man</span>/man1/phpize.<span style="color: #800080;">1</span><span style="color: #000000;">.gz [root@</span>*_* <span style="color: #800080;">14</span>:<span style="color: #800080;">48</span><span style="color: #000000;"> mcrypt]# phpize Configuring </span><span style="color: #0000ff;">for</span><span style="color: #000000;">: PHP Api Version: </span><span style="color: #800080;">20090626</span><span style="color: #000000;"> Zend Module Api No: </span><span style="color: #800080;">20090626</span><span style="color: #000000;"> Zend Extension Api No: </span><span style="color: #800080;">220090626</span>
执行完后，会发现当前目录下多了一些configure文件，最后执行php-config命令就基本完成了
执行以下命令，确保你的/usr/bin/php-config是存在的
[root@*_* <span style="color: #800080;">15</span>:<span style="color: #800080;">02</span> mcrypt]# <span style="color: #0000ff;">whereis</span> php-<span style="color: #000000;">config php</span>-config: /usr/bin/php-config /usr/share/<span style="color: #0000ff;">man</span>/man1/php-config.<span style="color: #800080;">1</span><span style="color: #000000;">.gz [root@</span>*_* <span style="color: #800080;">15</span>:<span style="color: #800080;">02</span> mcrypt]# ./configure --with-php-config=/usr/bin/php-config
如果遇到以下错误，请先安装gcc，命令yum install gcc
configure: error: no acceptable C compiler found <span style="color: #0000ff;">in</span> $PATH
直到不报错，出现：config.status: creating config.h，执行以下命令
[root@*_* <span style="color: #800080;">15</span>:<span style="color: #800080;">06</span> mcrypt]# <span style="color: #0000ff;">make</span> && <span style="color: #0000ff;">make</span> <span style="color: #0000ff;">install</span>
最后的最后，会提示你如下，说明你大功告成了
Installing shared extensions: /usr/lib64/php/modules/
顺便检查下/usr/lib64/php/modules/里的mrcypt.so扩展是否已经创建成功
然后的事就简单了，给你的php.ini添加一条extension=mcrypt.so
[root@*_* <span style="color: #800080;">15</span>:<span style="color: #800080;">09</span> mcrypt]# cd /etc/php.d
创建一个mrcypt.ini文件就行，里面写extension=mcrypt.so
[root@*_* 15:17 php.d]# echo 'extension=mcrypt.so' > mcrypt.ini
(3) 、重启apache，查阅phpinfo，mcrypt模块扩展是不是加载了？
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