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

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.