laravel 6 on php 7.1 code example

Example 1: laravel 5.8 installation

composer create-project --prefer-dist laravel/laravel blog "5.8.*"

Example 2: update php version in laravel

"config": {
    "platform": {
        "php": "7.0.7"
    },
    "preferred-install": "dist",
    "optimize-autoloader": true
}

run composer install