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下面由composer教程栏目给大家介绍composer require指定版本的方法，希望对需要的朋友有所帮助！
默认
composer require endroid/qr-code
指定版本
composer require endroid/qr-code 1.9.3
# 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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