这个版本需要安装php7么，不兼容5.6的么

[Martin0709]

λ composer install
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
- Installation request for doctrine/inflector v1.2.0 -> satisfiable by doctrine/inflector[v1.2.0].
- doctrine/inflector v1.2.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
Problem 2
- Installation request for vinkla/hashids 3.1.0 -> satisfiable by vinkla/hashids[3.1.0].
- vinkla/hashids 3.1.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
Problem 3
- Installation request for yajra/laravel-datatables-buttons v2.0.3 -> satisfiable by yajra/laravel-datatables-buttons[v2.0.3].
- yajra/laravel-datatables-buttons v2.0.3 requires php >=7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
Problem 4
- doctrine/inflector v1.2.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
- laravel/framework v5.4.30 requires doctrine/inflector ~1.0 -> satisfiable by doctrine/inflector[v1.2.0].
- Installation request for laravel/framework v5.4.30 -> satisfiable by laravel/framework[v5.4.30].

[lanceWan]

我安装的扩展好像要求7.0版本的