composer安装失败

Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The openssl extension is missing, which means that secure HTTPS transfers are impossible.
If possible you should enable it or recompile php with --with-openssl

一直出现这段错误提示,真的不知道怎么搞,php.ini的openssl已经启动了,查看phpinfo也能查看到openssl,我用的xampp集成的,php版本为5.6,求教啊,

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