执行composer install遇到错误：Your requirements could not be resolved to an installable set of packages. 这是因为不匹配composer.json要求的版本,错误代码如下。
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/annotations v1.6.0 -> satisfiable by doc trine/annotations[v1.6.0].
– doctrine/annotations v1.6.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 2
– Installation request for doctrine/cache v1.7.1 -> satisfiable by doctrine/ cache[v1.7.1].
– doctrine/cache v1.7.1 requires php ~7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 3
– Installation request for doctrine/collections v1.5.0 -> satisfiable by doc trine/collections[v1.5.0].
– doctrine/collections v1.5.0 requires php ^7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 4
– Installation request for doctrine/common v2.8.1 -> satisfiable by doctrine /common[v2.8.1].
– doctrine/common v2.8.1 requires php ~7.1 -> your PHP version (7.0.12) does not satisfy that requirement.
Problem 5
– Installation request for doctrine/dbal v2.7.1 -> satisfiable by doctrine/d bal[v2.7.1].
– doctrine/dbal v2.7.1 requires php ^7.1 -> your PHP version (7.0.12) does n ot satisfy that requirement.
Problem 6
– Installation request for doctrine/inflector v1.3.0 -> satisfiable by doctr ine/inflector[v1.3.0].
– doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.12) d oes not satisfy that requirement.
Problem 7
– Installation request for symfony/css-selector v4.1.0 -> satisfiable by sym fony/css-selector[v4.1.0].
– symfony/css-selector v4.1.0 requires php ^7.1.3 -> your PHP version (7.0.1 2) does not satisfy that requirement.
Problem 8
– Installation request for symfony/event-dispatcher v4.1.0 -> satisfiable by symfony/event-dispatcher[v4.1.0].
– symfony/event-dispatcher v4.1.0 requires php ^7.1.3 -> your PHP version (7 .0.12) does not satisfy that requirement.
Problem 9
– Installation request for symfony/translation v4.1.0 -> satisfiable by symf ony/translation[v4.1.0].
– symfony/translation v4.1.0 requires php ^7.1.3 -> your PHP version (7.0.12 ) does not satisfy that requirement.
Problem 10
– Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doc trine/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 11
– 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) doe s not satisfy that requirement.
Problem 12
– doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.12) d oes not satisfy that requirement.
– laravel/framework v5.5.40 requires doctrine/inflector ~1.1 -> satisfiable by doctrine/inflector[v1.3.0].
– Installation request for laravel/framework v5.5.40 -> satisfiable by larav el/framework[v5.5.40].
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查看了下资料说是php版本不符,打开composer.json发现代码只要求大于7.0.0可仍然报这个错误,不用太较真执行如下代码之后在运行之前的代码就ok
composer install –ignore-platform-reqs 或者 composer update –ignore-platform-reqs
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作者：xf-阿飞
来源：CSDN
原文：https://blog.csdn.net/sinat_33801009/article/details/81129800
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