linux下安装PHP5.5

下载安装包后，在安装php之前必须先安装libxml2，因此可以通过下载libxml2安装包，编译安装

我通过yum -y install libxml2 libxml2-devel(不安装这个的话，会找出解析错误)

配置： ./configure --prefix=/usr/local/php  --with-apxs2=/usr/local/apache/bin/apxs --with-mysql=/usr/local/mysql  --with-config-file-path=/usr/local/php --enable-mbstring=all

这是最简单或者是最基本的要求（前三个）

make                    

 make  install  若提示如下，则说明php安装成功啦

Installing PHP SAPI module:       apache2handler
/usr/local/apache2/build/instdso.sh SH_LIBTOOL='/usr/lib/apr-1/build/libtool' libphp5.la /usr/local/apache2/modules
/usr/lib/apr-1/build/libtool --mode=install cp libphp5.la /usr/local/apache2/modules/
libtool: install: cp .libs/libphp5.so /usr/local/apache2/modules/libphp5.so
libtool: install: cp .libs/libphp5.lai /usr/local/apache2/modules/libphp5.la
libtool: install: warning: remember to run `libtool --finish /home/Gogo_yueyue/下载/php-5.3.6/libs'
chmod 755 /usr/local/apache2/modules/libphp5.so
[activating module `php5' in /usr/local/apache2/conf/httpd.conf]
Installing PHP CLI binary:        /usr/local/bin/
Installing PHP CLI man page:      /usr/local/man/man1/
Installing build environment:     /usr/local/lib/php/build/
Installing header files:          /usr/local/include/php/
Installing helper programs:       /usr/local/bin/
  program: phpize
  program: php-config
Installing man pages:             /usr/local/man/man1/
  page: phpize.1
  page: php-config.1
Installing PEAR environment:      /usr/local/lib/php/
[PEAR] Archive_Tar    - installed: 1.3.7
[PEAR] Console_Getopt - installed: 1.3.0
[PEAR] Structures_Graph- installed: 1.0.4
[PEAR] XML_Util       - installed: 1.2.1
[PEAR] PEAR           - installed: 1.9.2
Wrote PEAR system config file at: /usr/local/etc/pear.conf
You may want to add: /usr/local/lib/php to your php.ini include_path
/home/Gogo_yueyue/下载/php-5.3.6/build/shtool install -c ext/phar/phar.phar /usr/local/bin
ln -s -f /usr/local/bin/phar.phar /usr/local/bin/phar
Installing PDO headers:          /usr/local/include/php/ext/pdo/

因此，我们要修改apache配置文件来支持php解析

AddType application/x-httpd-php .php .php3

表示apache服务中可以解析php格式文件 
接下来要检查apache目录下生成的php动态连接库文件，在目录/usr/local/apache/modules，找到是否存在 libphp5.so文件 

/usr/local/apache/bin/apachectl -M 查看所有支持的模块，可以查看到是否支持php5.so

再到/usr/local/apache/htdocs/下创建php文件，重启apache即可测试

出现的问题：

在重启apache出现了错误提示：httpd: Syntax error on line 53 of /usr/local/apache/conf/httpd.conf: Cannot load /usr/local/apache/modules/libphp5.so into server: /usr/local/apache/modules/libphp5.so: cannot restore segment prot after reloc: Permission denied

原因：是Linux有一个SELinux保护模式引起的。

解决办法：

1关闭SELINUX的方法:
vi /etc/selinux/config 将SELINUX=enforcing 改成SELINUX=disabled 需要重启
这个方法可能会对服务器带来风险。
2不关闭SELINUX的方法:
# setenforce 0
# chcon -c -v -R -u system_u -r object_r -t textrel_shlib_t /usr/local/apache/modules/libphp5.so

# service httpd restart
# setenforce 1