我的本地是7.0.1，而下载下来的原来是运行在7.0.8版本的，于是执行:composer install 时，报了一堆错。解决办法：删掉composer.lock,重新composer install
Problem 1
- Installation request for laravel/horizon v1.0.5 -> satisfiable by laravel/horizon[v1.0.5].
- laravel/horizon v1.0.5 requires ext-pcntl * -> the requested php extension pcntl is missing from your system.
Problem 2
- Installation request for symfony/console v3.3.10 -> satisfiable by symfony/console[v3.3.10].
- symfony/console v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 3
- Installation request for symfony/css-selector v3.3.10 -> satisfiable by symfony/css-selector[v3.3.10].
- symfony/css-selector v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 4
- Installation request for symfony/debug v3.3.10 -> satisfiable by symfony/debug[v3.3.10].
- symfony/debug v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 5
- Installation request for symfony/event-dispatcher v3.3.10 -> satisfiable by symfony/event-dispatcher[v3.3.10].
- symfony/event-dispatcher v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 6
- Installation request for symfony/finder v3.3.10 -> satisfiable by symfony/finder[v3.3.10].
- symfony/finder v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 7
- Installation request for symfony/http-foundation v3.3.10 -> satisfiable by symfony/http-foundation[v3.3.10].
- symfony/http-foundation v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 8
- Installation request for symfony/http-kernel v3.3.10 -> satisfiable by symfony/http-kernel[v3.3.10].
- symfony/http-kernel v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 9
- Installation request for symfony/process v3.3.10 -> satisfiable by symfony/process[v3.3.10].
- symfony/process v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 10
- Installation request for symfony/routing v3.3.10 -> satisfiable by symfony/routing[v3.3.10].
- symfony/routing v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 11
- Installation request for symfony/translation v3.3.10 -> satisfiable by symfony/translation[v3.3.10].
- symfony/translation v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 12
- Installation request for symfony/var-dumper v3.3.10 -> satisfiable by symfony/var-dumper[v3.3.10].
- symfony/var-dumper v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
Problem 13
- 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 (7.0.1) does not satisfy that requirement.
Problem 14
- symfony/console v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.1) does not satisfy that requirement.
- psy/psysh v0.8.13 requires symfony/console ~2.3.10|^2.4.2|~3.0 -> satisfiable by symfony/console[v3.3.10].
- Installation request for psy/psysh v0.8.13 -> satisfiable by psy/psysh[v0.8.13].
To enable extensions, verify that they are enabled in your .ini files:
- D:\phpStudy\php70n\php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.