WampServer3.0, I used PHP5.6.16 before. After switching to PHP7.0, the icon changed from green to yellow. How to solve it?

Windows7 64-bit system, WampServer3.0 is installed, which comes with two php versions, php5.6.16 and php7.0. I have been using php5.6.16 before, but today I want to try php7.0, so I click on the green icon of WampServer in the taskbar tray area and select PHP-Version-7.0.0, as shown in the picture:

Then I exited WampServer3.0 and then restarted, but the icon was always yellow, prompting: "The server is offline - 1/2 services are running". How to solve it?

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Windows7 64-bit system, WampServer3.0 is installed, which comes with two php versions, php5.6.16 and php7.0. I have been using php5.6.16 before, but today I want to try php7.0, so I click on the green icon of WampServer in the taskbar tray area and select PHP-Version-7.0.0, as shown in the picture:

Then I exited WampServer3.0 and then restarted, but the icon was always yellow, prompting: "The server is offline - 1/2 services are running". How to solve it?

I have never successfully run WAMP Server 3.0. PHP cannot load mysqli and other extensions, and phpinfo() sees that the location of php.ini is the directory of Apache. After copying php.ini, Apache stops running directly, so Change back to UPUPW_Nginx.

Why can mine be done