我无法安装所有laravel依赖项，因为php版本但我使用xampp（PHP 7.0.13）使用echo phpversion();来确定我的php版本但是这个laravel一直告诉我我正在使用php版本5.4.24当我安装一个新的laravel目录时。
Microsoft Windows [Version 10.0.14393]
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C:\Users\User>cd C:\xampp
C:\xampp>laravel new htdocs
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 >=5.6.4 but your PHP version (5.4.24) does not satisfy that requirement.
Problem 2
- Installation request for classpreloader/classpreloader 3.1.0 -> satisfiable by classpreloader/classpreloader[3.1.0].
- classpreloader/classpreloader 3.1.0 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 3
- Installation request for laravel/framework v5.3.28 -> satisfiable by laravel/framework[v5.3.28].
- laravel/framework v5.3.28 requires php >=5.6.4 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 4
- Installation request for league/flysystem 1.0.32 -> satisfiable by league/flysystem[1.0.32].
- league/flysystem 1.0.32 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 5
- Installation request for nikic/php-parser v3.0.2 -> satisfiable by nikic/php-parser[v3.0.2].
- nikic/php-parser v3.0.2 requires php >=5.5 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 6
- Installation request for symfony/console v3.1.8 -> satisfiable by symfony/console[v3.1.8].
- symfony/console v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 7
- Installation request for symfony/debug v3.1.8 -> satisfiable by symfony/debug[v3.1.8].
- symfony/debug v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 8
- Installation request for symfony/event-dispatcher v3.2.1 -> satisfiable by symfony/event-dispatcher[v3.2.1].
- symfony/event-dispatcher v3.2.1 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 9
- Installation request for symfony/finder v3.1.8 -> satisfiable by symfony/finder[v3.1.8].
- symfony/finder v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 10
- Installation request for symfony/http-foundation v3.1.8 -> satisfiable by symfony/http-foundation[v3.1.8].
- symfony/http-foundation v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 11
- Installation request for symfony/http-kernel v3.1.8 -> satisfiable by symfony/http-kernel[v3.1.8].
- symfony/http-kernel v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 12
- Installation request for symfony/process v3.1.8 -> satisfiable by symfony/process[v3.1.8].
- symfony/process v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 13
- Installation request for symfony/routing v3.1.8 -> satisfiable by symfony/routing[v3.1.8].
- symfony/routing v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 14
- Installation request for symfony/translation v3.1.8 -> satisfiable by symfony/translation[v3.1.8].
- symfony/translation v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 15
- Installation request for symfony/var-dumper v3.1.8 -> satisfiable by symfony/var-dumper[v3.1.8].
- symfony/var-dumper v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 16
- Installation request for phpdocumentor/reflection-common 1.0 -> satisfiable by phpdocumentor/reflection-common[1.0].
- phpdocumentor/reflection-common 1.0 requires php >=5.5 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 17
- Installation request for phpdocumentor/reflection-docblock 3.1.1 -> satisfiable by phpdocumentor/reflection-docblock[3.1.1].
- phpdocumentor/reflection-docblock 3.1.1 requires php >=5.5 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 18
- Installation request for phpdocumentor/type-resolver 0.2.1 -> satisfiable by phpdocumentor/type-resolver[0.2.1].
- phpdocumentor/type-resolver 0.2.1 requires php >=5.5 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 19
- Installation request for phpunit/php-code-coverage 4.0.4 -> satisfiable by phpunit/php-code-coverage[4.0.4].
- phpunit/php-code-coverage 4.0.4 requires php ^5.6 || ^7.0 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 20
- Installation request for phpunit/phpunit 5.7.5 -> satisfiable by phpunit/phpunit[5.7.5].
- phpunit/phpunit 5.7.5 requires php ^5.6 || ^7.0 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 21
- Installation request for phpunit/phpunit-mock-objects 3.4.3 -> satisfiable by phpunit/phpunit-mock-objects[3.4.3].
- phpunit/phpunit-mock-objects 3.4.3 requires php ^5.6 || ^7.0 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 22
- Installation request for sebastian/code-unit-reverse-lookup 1.0.0 -> satisfiable by sebastian/code-unit-reverse-lookup[1.0.0].
- sebastian/code-unit-reverse-lookup 1.0.0 requires php >=5.6 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 23
- Installation request for sebastian/environment 2.0.0 -> satisfiable by sebastian/environment[2.0.0].
- sebastian/environment 2.0.0 requires php ^5.6 || ^7.0 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 24
- Installation request for sebastian/object-enumerator 2.0.0 -> satisfiable by sebastian/object-enumerator[2.0.0].
- sebastian/object-enumerator 2.0.0 requires php >=5.6 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 25
- Installation request for sebastian/resource-operations 1.0.0 -> satisfiable by sebastian/resource-operations[1.0.0].
- sebastian/resource-operations 1.0.0 requires php >=5.6.0 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 26
- Installation request for sebastian/version 2.0.1 -> satisfiable by sebastian/version[2.0.1].
- sebastian/version 2.0.1 requires php >=5.6 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 27
- Installation request for symfony/css-selector v3.1.8 -> satisfiable by symfony/css-selector[v3.1.8].
- symfony/css-selector v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 28
- Installation request for symfony/dom-crawler v3.1.8 -> satisfiable by symfony/dom-crawler[v3.1.8].
- symfony/dom-crawler v3.1.8 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 29
- Installation request for symfony/yaml v3.2.1 -> satisfiable by symfony/yaml[v3.2.1].
- symfony/yaml v3.2.1 requires php >=5.5.9 -> your PHP version (5.4.24) does not satisfy that requirement.
Problem 30
- nikic/php-parser v3.0.2 requires php >=5.5 -> your PHP version (5.4.24) does not satisfy that requirement.
- psy/psysh v0.8.0 requires nikic/php-parser ~1.3|~2.0|~3.0 -> satisfiable by nikic/php-parser[v3.0.2].
- Installation request for psy/psysh v0.8.0 -> satisfiable by psy/psysh[v0.8.0].
Application ready! Build something amazing.
C:\xampp>
答案 0 :(得分：2)
已经解决了。看来我的系统正在使用IIS Express的另一个php版本，它使用旧版本的php。我只是将环境变量更改为指向我的xampp php，其中包含最新的php版本
答案 1 :(得分：1)
我刚才有这个问题，我通过将操作系统中的Path环境变量更改为指向包含最新php版本的wamp php文件夹来修复它。 为了做到这一点（我也必须研究这个） - 我去了这个链接并按照说明进行了操作：https://www.java.com/en/download/help/path.xml
旧的Path变量看起来像这样：C：\ wamp64 \ bin \ php \ php5.6.25我将其更改为C：\ wamp64 \ bin \ php \ php7.0.10 保存所有内容，关闭所有内容，重新启动我的电脑然后它没有任何问题。 希望这为某人节省了一些研究时间。
答案 2 :(得分：1)
你需要做两件事之一。
解决方案1 - 您需要更新PHP版本。如果您的版本不正确，Laravel将无法正常运行。
解决方案2 - 也许您拥有正确的PHP版本，但作曲家出于某种原因无法看到它。轻松修复，您只需使用--ignore-platform-reqs命令即可。这将允许您使用composer安装东西，无论PHP版本如何。