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php curl扩展开启
window下安装php_curl扩展支持

1.找到php.ini

修改extension=php_curl.dll 把前面的分号去掉;
注意phpinfo()信息中php.ini 的path

ubuntu linux 下php_curl扩展支持
1.在web服务器目录( Ubuntu下的通常为 /var/www )新建test.php文件
  2.编辑文件,键入下面一行代码:phpinfo();
  3.保存文件
  4.打开浏览器,浏览该网页。(例如:http://localhost/test.php)
  5.搜索"curl",看看是否已经安装了curl。没搜到的话肯定是没装了,要装的请看下面。
  安装方法很简单,只需要一条命令。(这里选择直接apt-get安装,因为比起自己编译简单多了,不需要自己配置什么)
  # sudo apt-get install curl libcurl3 libcurl3-dev php5-curl
  恭喜,PHP5 cURL安装完毕。记得重启Apache服务器
  # sudo /etc/init.d/apache2 restart
  如果仍然有问题,尝试编辑你的php.ini文件(我的是/etc/php5/apache2/php.ini),在最后加上一行:
  extension=curl.so
  保存文件后重启Apache服务器。

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