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my PHP version: PHP 8.0.0rc1

When I'm trying to install a new laravel project with laravel new project-name command, i get this errors:

Your requirements could not be resolved to an installable set of packages. Problem 1 - This package requires php ^7.3 but your PHP version (8.0.0rc1) does not satisfy that requirement. Problem 2 - Installation request for asm89/stack-cors v2.0.1 -> satisfiable by asm89/stack- cors[v2.0.1]. - asm89/stack-cors v2.0.1 requires php ^7.0 -> your PHP version (8.0.0rc1) does not satisfy that requirement. Problem 3 - Installation request for laravel/framework v8.10.0 -> satisfiable by laravel/framework[v8.10.0]. - laravel/framework v8.10.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. . . . To enable extensions, verify that they are enabled in your .ini files: - /etc/php/8.0/cli/php.ini - /etc/php/8.0/cli/conf.d/10-opcache.ini - /etc/php/8.0/cli/conf.d/10-pdo.ini . . You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

is there any problem with my composer or my php version?

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  • You're trying to used non-stable versions of things. Perhaps raise the issues with the relevant developers. Commented Oct 16, 2020 at 18:22
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    There isn't a problem with Composer and only one of the problems is to do with the PHP install itself. The first package you're trying to pull in is constrained by php ^7.3 meaning 7.3 and above but lower than 8 will satisfy it. Problem 2 is the same but with ^7.0 instead. Here is a representation: https://jubianchi.github.io/semver-check/#/^7.3/8 . Problem 3 is saying that you're version of PHP doesn't have the mbstring extension enabled. Commented Oct 16, 2020 at 18:24
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