网上给出了很多解决方法都为解决，现分享如下：
win7 64位系统，，apache24,PHP5.6.6。
除了将PHP.ini中的;extension=php_curl.dll前面的";"去掉，还需要如下操作，
I
had to also also copy libssh2.dll into my Apache24 folder for this to
work with my PHP 5.6.2 installation. So altogether I had to do the
following:
Move to Windows\system32 folder:
libssh2.dll, php_curl.dll, ssleay32.dll, libeay32.dll
Move to Apache24\bin folder
libssh2.dll
Uncomment extension=php_curl.dll
链接：
Win7 64位系统，PHP 扩展 curl方法