为什么laravel 5.6在wamp上更新php 7.1.3后没有安装？

Question

I am unable to install Laravel 5.6 on my wamp server. I have following setup

• PHP Version 7.1.3
• Composer Version 1.6.3 2018-01-31

When I am trying to install laravel application through composer, I am receiving following error in cmd

Warning: count(): Parameter must be an array or an object that implements Counta ble in C:\\Users\\MyName\\AppData\\Roaming\\Composer\\vendor\\symfony\\process\\Pipes\\Windo wsPipes.php on line 221

cmd returning these errors multiple times and at the end the error following message receiving

Application ready! Build something amazing.

When I am trying to run this command php artisan serve then cmd return following error

Warning: require(D:\\wamp64\\www\\Laravel5.6\\PR/vendor/autoload.php): failed to ope n stream: No such file or directory in D:\\wamp64\\www\\Laravel5.6\\PR\\artisan on li ne 18

Fatal error: require(): Failed opening required 'D:\\wamp64\\www\\Laravel5.6\\PR/ven dor/autoload.php' (include_path='.;C:\\php\\pear') in D:\\wamp64\\www\\Laravel5.6\\PR\\ artisan on line 18

I have searched about it and found a couple of articles but all of them are saying this is about PHP version and some are saying I need to update the composer and some says I need to stop proxy or any anti-virus software.

I have done all above steps as instructed in different articles but still facing the same problem. I am still failed to install laravel 5.6 .

I would like to appreciate if someone guides me that how can I fix the issue.

Edited

After following the instruction of @laravel levaral answer, I am facing below following errors.

[Composer\Exception\NoSslException]
  The openssl extension is required for SSL/TLS protection but is not availab
  le. If you can not enable the openssl extension, you can disable this error
  , at your own risk, by setting the 'disable-tls' option to true.


create-project [-s|--stability STABILITY] [--prefer-source] [--prefer-dist] [--r
epository REPOSITORY] [--repository-url REPOSITORY-URL] [--dev] [--no-dev] [--no
-custom-installers] [--no-scripts] [--no-progress] [--no-secure-http] [--keep-vc
s] [--remove-vcs] [--no-install] [--ignore-platform-reqs] [--] [<package>] [<dir
ectory>] [<version>]

The above errors are also in the cmd

Edited

I have tried all below method but still facing the errors

Answer 1

Try to install latest version of wamp and check with below command

    composer update --no-scripts
    composer dump-autoload

Answer 2

Try running

composer update

in your project folder and it should install the vendor package that you need in order to run your project.