Linux在php socket连接时报错：permission denied

解决办法：

# setsebool httpd_can_network_connect=1

参考来源:

http://www.cppblog.com/colorful/archive/2013/07/29/202222.html

http://hi.baidu.com/zwfec/item/64ef5ed9bf1cb3feca0c397c