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How does composer require specify the version?

藏色散人
Release： 2020-08-19 13:28:29
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The following tutorial column of composer will introduce to you how to require a specified version of composer. I hope it will be helpful to friends who need it!

How does composer require specify the version?

Default

composer require endroid/qr-code
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Specified version

composer require endroid/qr-code 1.9.3
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# composer require endroid/qr-code 1.9.3
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 1 update, 0 removals
  - Removing endroid/qr-code (2.5.1)
  - Installing endroid/qr-code (1.9.3): Downloading (100%)         
    The Process class relies on proc_open, which is not available on your PHP installation.
    The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems)
    Unzip with unzip command failed, falling back to ZipArchive class
Writing lock file
Generating autoload files
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