This package requires php ^7.1.3 but your PHP version (7.0.12) does not satisfy that requirement报错提示，怎么解决
Laravel项目在开发时，初始化项目过程中
This package requires php ^7.1.3 but your PHP version (7.0.12) does not satisfy that requirement错误的解决方法：
分析：以下错误为php版本太低导致，所以我们需要清理composer.lock文件。
解决方法是：
删除 composer.lock 文件，重新执行 composer install，这样就能重新生成 composer.lock 文件了。
$ laravel new katCMS
Crafting application…
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.
Problem 1
– This package requires php ^7.1.3 but your PHP version (7.0.12) does not satisfy that requirement.
Problem 2
– Installation request for doctrine/inflector v1.3.0 -> satisfiable by doctrine/inflector[v1.3.0].
– doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 3
– Installation request for laravel/framework v5.6.26 -> satisfiable by laravel/framework[v5.6.26].
– laravel/framework v5.6.26 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 4
– Installation request for symfony/console v4.1.1 -> satisfiable by symfony/console[v4.1.1].
– symfony/console v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 5
– Installation request for symfony/css-selector v4.1.1 -> satisfiable by symfony/css-selector[v4.1.1].
– symfony/css-selector v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 6
– Installation request for symfony/debug v4.1.1 -> satisfiable by symfony/debug[v4.1.1].
– symfony/debug v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 7
– Installation request for symfony/event-dispatcher v4.1.1 -> satisfiable by symfony/event-dispatcher[v4.1.1].
– symfony/event-dispatcher v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 8
– Installation request for symfony/finder v4.1.1 -> satisfiable by symfony/finder[v4.1.1].
– symfony/finder v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 9
– Installation request for symfony/http-foundation v4.1.1 -> satisfiable by symfony/http-foundation[v4.1.1].
– symfony/http-foundation v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 10
– Installation request for symfony/http-kernel v4.1.1 -> satisfiable by symfony/http-kernel[v4.1.1].
– symfony/http-kernel v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 11
– Installation request for symfony/process v4.1.1 -> satisfiable by symfony/process[v4.1.1].
– symfony/process v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 12
– Installation request for symfony/routing v4.1.1 -> satisfiable by symfony/routing[v4.1.1].
– symfony/routing v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 13
– Installation request for symfony/translation v4.1.1 -> satisfiable by symfony/translation[v4.1.1].
– symfony/translation v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 14
– Installation request for symfony/var-dumper v4.1.1 -> satisfiable by symfony/var-dumper[v4.1.1].
– symfony/var-dumper v4.1.1 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 15
– Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doctrine/instantiator[1.1.0].
– doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 16
– Installation request for myclabs/deep-copy 1.8.1 -> satisfiable by myclabs/deep-copy[1.8.1].
– myclabs/deep-copy 1.8.1 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 17
– Installation request for nunomaduro/collision v2.0.3 -> satisfiable by nunomaduro/collision[v2.0.3].
– nunomaduro/collision v2.0.3 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 18
– Installation request for phpunit/php-code-coverage 6.0.7 -> satisfiable by phpunit/php-code-coverage[6.0.7].
– phpunit/php-code-coverage 6.0.7 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 19
– Installation request for phpunit/php-file-iterator 2.0.1 -> satisfiable by phpunit/php-file-iterator[2.0.1].
– phpunit/php-file-iterator 2.0.1 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 20
– Installation request for phpunit/php-timer 2.0.0 -> satisfiable by phpunit/php-timer[2.0.0].
– phpunit/php-timer 2.0.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 21
– Installation request for phpunit/php-token-stream 3.0.0 -> satisfiable by phpunit/php-token-stream[3.0.0].
– phpunit/php-token-stream 3.0.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 22
– Installation request for phpunit/phpunit 7.2.6 -> satisfiable by phpunit/phpunit[7.2.6].
– phpunit/phpunit 7.2.6 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 23
– Installation request for sebastian/comparator 3.0.1 -> satisfiable by sebastian/comparator[3.0.1].
– sebastian/comparator 3.0.1 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 24
– Installation request for sebastian/diff 3.0.1 -> satisfiable by sebastian/diff[3.0.1].
– sebastian/diff 3.0.1 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 25
– laravel/framework v5.6.26 requires php ^7.1.3 -> your PHP version (7.0.12) does not satisfy that requirement.
– laravel/tinker v1.0.7 requires illuminate/console ~5.1 -> satisfiable by laravel/framework[v5.6.26].
– Installation request for laravel/tinker v1.0.7 -> satisfiable by laravel/tinker[v1.0.7].
Application ready! Build something amazing.
