php安装json模块

centOS上
因为看php源码中没有json模块，于是采用pecl自动编译安装：
# yum install php-devel
# yum install php-pear
# yum install gcc
# pear install pecl/json

# cd /etc/php.d
# echo “extension=json.so” > json.ini
# service httpd restart