yii2：xampp升级到php7

I have a new project in yii2, I downloaded yii2 using composer and when I try to download the extension it tells me to upgrade my PHP from 5 to 5.6 or higher. Then I upgraded it to 7.1.3 the old projects works fine and the phpMyAdmin too afterwards I tried to install the extension again. It gives me the same message.

Problem 1

  • sebastian/version 2.0.1 requires php >=5.6 -> your PHP version (5.5.34) does not satisfy that requirement.

  • sebastian/version 2.0.1 requires php >=5.6 -> your PHP version (5.5.34) does not satisfy that requirement.

  • Installation request for sebastian/version (installed at 2.0.1) -> satisfiable by sebastian/version[2.0.1].

What is wrong here?

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