在Laravel 5.4中安装dompdf时出错

Question

I run this to install dompdf:

composer require barryvdh/laravel-dompdf

And the error looks like this:

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for barryvdh/laravel-dompdf ^0.8.1 -> satisfiable by barryvdh/laravel-dompdf[v0.8.1].
    - Conclusion: remove dompdf/dompdf v0.7.0
    - Conclusion: don't install dompdf/dompdf v0.7.0
    - barryvdh/laravel-dompdf v0.8.1 requires dompdf/dompdf ^0.8 -> satisfiable by dompdf/dompdf[v0.8.0, v0.8.1].
    - Can only install one of: dompdf/dompdf[v0.8.0, v0.7.0].
    - Can only install one of: dompdf/dompdf[v0.8.1, v0.7.0].
    - Installation request for dompdf/dompdf (locked at v0.7.0) -> satisfiable by dompdf/dompdf[v0.7.0].


Installation failed, reverting ./composer.json to its original content.

Any of you know what's wrong or what should i do?

Answer 1

The error message states that barryvdh/laravel-dompdf package require "dompdf/dompdf": "^0.8" which is newer version but you have dompdf/dompdf v0.7.0 which is older version installed.

So you should try to remove old version of dompdf to install new version.