Laravel project creation, Your requirements could not be resolved to an installable set of packages

Question

I'm trying to create a project using a composer. I use the following command. My folder consist of another project but in a separate folder.

composer create-project --prefer-dist laravel/laravel blog

The error I get is,

Your requirements could not be resolved to an installable set of packages.

Some answers in Stackoverflow says to upgrade the PHP. But in my case it's already updated to newest version. php -v says,

Is there any solution? Any suggestion is warmly welcome.

Edit: I installed the php mbstring but I get the same error.

Answer 1

If you're running PHP 5

sudo apt-get install php5-mbstring

If you're running PHP 7

sudo apt-get install php7.0-mbstring

Also, read Laravel's requirements: https://laravel.com/docs/5.4/installation

There may be other dependencies you haven't installed:

• PHP >= 5.6.4
• OpenSSL PHP Extension
• PDO PHP Extension
• Mbstring PHP Extension
• Tokenizer PHP Extension
• XML PHP Extension