http://www.cnblogs.com/jsn521/p/3399997.html

如果extension_dir  里面配置了插件库的路径  zend_extension = "php_xdebug-2.4.1-5.6-vc11-x86_64.dll" 就可以不用写全路径了

https://xdebug.org/wizard.php
将 phpinfo里面的信息复制到这个网址就可以查看自己 需要下载的xdebug的版本
查看xdebug模块是否被apache加载进去
     cmd，进入到php.exe的路径执行 php.exe -m 在最后查看是否存在Xdehug

Download php_xdebug-2.4.1-5.6-vc11-x86_64.dll
Move the downloaded file to D:\win10-2016-2-23\xampp2\php\ext
Edit D:\win10-2016-2-23\xampp2\php\php.ini and add the line
zend_extension = D:\win10-2016-2-23\xampp2\php\ext\php_xdebug-2.4.1-5.6-vc11-x86_64.dll

参考链接
   http://www.cnblogs.com/jsn521/p/3399997.html
   http://www.easytd.com/yichangjijin/d_15111008222.html
   https://xdebug.org/wizard.php