不需要重新编译php，可以动态扩展php模块

这里以扩展mysqli为例：

1.安装phpize需要的依赖包

# yum install m4 autoconf

2.生成编译mysqli的configure

进入PHP源码目录中扩展模块目录ext
# cd /app/httpd/php-5.6.34/ext/mysqli

#/usr/local/php/bin/phpize
Configuring for:
PHP Api Version:         20131106
Zend Module Api No:      20131226
Zend Extension Api No:   220131226

3.查下当前PHP的扩展目录

# /usr/local/php/bin/php-config --extension-dir
/usr/local/php-5.6.34/lib/php/extensions/no-debug-non-zts-20131226

4.编译mysqli

# ./configure --with-php-config=/usr/local/php/bin/php-config --with-mysqli=/usr/local/mysql/bin/mysql_config

#make && make install clean

Installing shared extensions:     /usr/local/php-5.6.34/lib/php/extensions/no-debug-non-zts-20131226/
Installing header files:           /usr/local/php-5.6.34/include/php/

5.检查

#ll /usr/local/php-5.6.34/lib/php/extensions/no-debug-non-zts-20131226/
-rwxr-xr-x 1 root root  715322 Mar  5 16:11 mysqli.so

6.添加启用mysqli

#vim /etc/php.ini

找到[MySQLi]配置块
添加
extension=mysqli.so

7.重启php