php安装扩展
phpize是属于php-devel的内容，所以要运行
yum install php-devel就行。
php安装mbstring扩展的二种方法
1.执行
yum install php-mbstring
2. 修改php.ini (这一步非常重要, 部分lxadmin版本无法自动修改)
echo ‘extension=mbstring.so' >>/etc/php.ini #更具php安装目录而定
3. 重启web service
如果是apache: service httpd restart
方法二：
php 5.36
安装目录：/usr/local/php
#cd /usr/src/php-5.3.6/ext/mbstring
#/usr/local/php/bin/phpize
#./configure --with-php-config=/usr/local/php/bin/php-config
#make && make install
echo ‘extension=mbstring.so' >>/usr/local/php/lib/php.ini
#/usr/local/apache2/bin/apachectl restart
使用/usr/local/php/bin/php -v #查看配置是否错误
使用php.info查看mbstring是否安装成功
安装环境
RHEL 4
PHP 5.2.6
所需软件
libevent-1.4.6-stable.tar.gz (http://monkey.org/~provos/libevent/)
memcache-2.2.3.tgz (http://pecl.php.net/package/memcache)
memcached-1.2.6.tar.gz (最新版已经是memcached-1.4.5.tar.gz) (http://memcached.org/)
安装配置
1. 安装libevent
# tar zxf libevent-1.4.6-stable.tar.gz
# cd libevent-1.4.6-stable
# ./configure --prefix=/usr/local/servers/libevent
# make && make install
2. 安装memcached
# tar zxvf memcached-1.2.6.tar.gz
# cd memcached-1.2.6
# ./configure --prefix=/usr/local/servers/memcached --with-libevent=/usr/local/servers/libevent
# make && make install
3. 运行memcached
# /usr/local/servers/memcached -d -m 128 -l localhost -p 11211 -u root
-d 以守护程序（daemon）方式运行 memcached；
-m 设置 memcached 可以使用的内存大小，单位为 M；
-l 设置监听的 IP 地址，如果是本机的话，通常可以不设置此参数；
-p 设置监听的端口，默认为 11211，所以也可以不设置此参数；
-u 指定用户;
如果遇到运行memcached时遇到问题，错误提示如下：
/usr/local/servers/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory
则运行 LD_DUBUG=libs 就可以知道memcached启动时库的加载路径。具体如下:
# LD_DEBUG=libs /usr/local/servers/memcached/bin/memcached -v
10929: find library=libevent-1.4.so.2 [0]; searching
10929: search cache=/etc/ld.so.cache
10929: search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path)
10929: trying file=/lib/tls/i686/sse2/libevent-1.4.so.2
10929: trying file=/lib/tls/i686/libevent-1.4.so.2
10929: trying file=/lib/tls/sse2/libevent-1.4.so.2
10929: trying file=/lib/tls/libevent-1.4.so.2
10929: trying file=/lib/i686/sse2/libevent-1.4.so.2
10929: trying file=/lib/i686/libevent-1.4.so.2
10929: trying file=/lib/sse2/libevent-1.4.so.2
10929: trying file=/lib/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/i686/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/libevent-1.4.so.2
10929: trying file=/usr/lib/i686/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/i686/libevent-1.4.so.2
10929: trying file=/usr/lib/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/libevent-1.4.so.2
10929:
然后给libevent-1.4.so.2建立一个链接后再运行memcached：
# ln -s /usr/local/servers/libevent/lib/libevent-1.4.so.2 /lib/libevent-1.4.so.2
4. 安装php的memcache扩展
可以使用php自带的pecl安装程序
# /usr/local/servers/php5/bin/pecl install memcache
也可以从源码安装
# tar zxf memcache-2.2.3.tgz
# cd memcache-2.2.3
# /usr/local/servers/php5/bin/phpize
# ./configure --enable-memcache=/usr/local/servers/memcached --with-php-config=/usr/local/servers/php5/bin/php-config --with-apxs2=/usr/sbin/apxs
# make && make inst
安装完后会有类似这样的提示：
Installing shared extensions: /usr/local/servers/php5/lib/php/extensions/no-debug-non-zts-20060922/
把这个记住，然后修改php.ini，把
extension_dir = "./"
修改为
extension_dir = "/usr/local/servers/php5/lib/php/extensions/"
并添加一行
extension="no-debug-non-zts-20060922/memcache.so"
5. 用phpinfo查看
测试模块
<?php
$memcache = new Memcache;
$memcache->connect('localhost', 12000) or die ("Could not connect");
$version = $memcache->getVersion();
echo "Server's version: ".$version."<br/>\n";
$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;
$memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
echo "Store data in the cache (data will expire in 10 seconds)<br/>\n";
$get_result = $memcache->get('key');
echo "Data from the cache:<br/>\n";
var_dump($get_result);
?>
显示结果:
Server's version: 1.2.6
Store data in the cache (data will expire in 10 seconds)
Data from the cache:
object(stdClass)[3] public 'str_attr' => string 'test' (length=4) public 'int_attr' => int 123
