How to solve the problem of composer installing composer package reporting Your requirements could not be resolved

This article mainly introduces how to solve the composer installation composer package Your requirements could not be resolved, the article is very detailed, has a certain reference value, interested friends must read it!

One: encountered Your requirements could not be resolved to an installable set of packages when installing composer package using composer

Analysis:

This is because version 1.1.0 of doctrine/instantiator must be PHP7.1, but my PHP environment is PHP7.0.12, but I found a problem. There is no doctrine/instantiator package information in my composer.json file, so why report such an error?

At this time, I found vendor/doctrine/instantiator and found that the doctrine/instantiator package had been installed in my framework. I opened the composer.json file in the vendor/doctrine/instantiator directory and found that the environment needed for this package was PHP7.1:

Find the address of the doctrine/instantiator package: https://packagist.org/package...

At this time, I found that the PHP environment required for version 1.1.0 of doctrine/instantiator is 7.1, so I wonder if the installation of the composer package in this framework failed because the version of the doctrine/instantiator package in my framework is 1.1.0?

Resolve:

1: change the version of the doctrine/instantiator package to the version we need (here I change the version of the doctrine/instantiator package to 1.0.x-dev)

Composer require doctrine/instantiator "1.0.x-dev"

2: change the doctrine/instantiator package to the required version, and then install the composer package you need. At this time, the error will not be reported (let me take the huaweichenai/baidu-discern package as an example)

This is a successful installation using composer.

There is a method on the Internet: use the composer install-- ignore-platform-reqs command to set to ignore version matching and then install the composer package you need. After testing, I found that there was still an error, but the specific reason is not clear. If you know why, you are welcome to leave a message to tell the blogger.

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