yum -y install openssl

/usr/local/bin/是php的安装目录
切换到php安装目录的etx/openssl目录
cd /usr/local/src/php-5.2.8/ext/openssl

/usr/local/bin/phpize

Cannot find config.m4.
Make sure that you run '/usr/local/bin/phpize' in the top level source directory of the module

查看openssl目录下有个config.w32和config0.m4，把config0.m4改名为config.m4。
mv config0.m4 config.m4

执行：

/usr/local/bin/phpize

编译：

./configure --with-openssl --with-php-config=/usr/local/bin/php-config
make;make install

提示成功后，在php.ini里加入extension = openssl.so
重启apache或php-fpm，完成.