您可能需要编辑 php.ini 文件并重新启动服务器.在 php.ini 配置中添加绝对路径.它适用于我的Windows 8.1机器中的xampp服务器.
示例:
extension_dir ="\ xampp \ php \ ext" 到 extension_dir ="C:\ xampp \ php \ ext"
参考:

You may need to edit your php.ini file and restart the server. Add absolute paths in php.ini configuration. It worked for xampp server in my windows 8.1 machine.
example:
extension_dir="\xampp\php\ext" to extension_dir="C:\xampp\php\ext"
Reference: How to fix PHP Warning: PHP Startup: Unable to load dynamic library 'ext\\php_curl.dll'?