Composer & Plesk，遇到 PHP 版本问题

Question

我目前正在尝试让我的 Laravel 应用程序运行ning 落后于 Plesk Onyx。现在尝试运行 composer install 时，我收到以下错误消息：

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

  Problem 1
    - Installation request for doctrine/inflector v1.3.0 -> satisfiable by doctrine/inflector[v1.3.0].
    - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.27) does not satisfy that requirement.
  Problem 2
    - Installation request for symfony/css-selector v4.0.6 -> satisfiable by symfony/css-selector[v4.0.6].
    - symfony/css-selector v4.0.6 requires php ^7.1.3 -> your PHP version (7.0.27) does not satisfy that requirement.
  Problem 3
    - Installation request for symfony/event-dispatcher v4.0.6 -> satisfiable by symfony/event-dispatcher[v4.0.6].
    - symfony/event-dispatcher v4.0.6 requires php ^7.1.3 -> your PHP version (7.0.27) does not satisfy that requirement.
  Problem 4
    - Installation request for symfony/translation v4.0.6 -> satisfiable by symfony/translation[v4.0.6].
    - symfony/translation v4.0.6 requires php ^7.1.3 -> your PHP version (7.0.27) does not satisfy that requirement.
  Problem 5
    - Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doctrine/instantiator[1.1.0].
    - doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.27) does not satisfy that requirement.
  Problem 6
    - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.27) does not satisfy that requirement.
    - laravel/framework v5.5.39 requires doctrine/inflector ~1.1 -> satisfiable by doctrine/inflector[v1.3.0].
    - Installation request for laravel/framework v5.5.39 -> satisfiable by laravel/framework[v5.5.39].

好的。我肯定理解这些错误。我运行 Debian 9 和 "PHP by OS Vendor" 是 7.0.27。但是，我知道服务器上安装了 PHP 7.1+（甚至 7.2），因为 Plesk 让我选择（对于域和虚拟主机）这些版本。我现在的问题是：如何告诉 composer 使用安装在服务器上的某个 PHP 版本，这如何在带有 Plesk 的 Debian 下工作？

编辑：我没有全局安装 Composer。就 https://getcomposer.org/download/ "Command-line installation".

Answer 1

方法如下：

找到 Plesk 使用的 PHP 路径。就我而言，这是 /opt/plesk/php/。在这个文件夹里面，根据安装的PHP个版本有文件夹：7.0、7.1、7.2。所以 php composer.phar install 变成 /opt/plesk/php/7.2/bin/php composer.phar install。＆有用。 :-)

Answer 2

您可以使用 composer.json 中的 platform 设置来模拟 PHP 版本：

"config": {
    "platform": {
        "php": "7.1"
    }
},

Composer 将在安装和更新期间假定 PHP 版本为 7.1，即使您实际安装时使用的是 7.0。

这只会影响 Composer 安装和更新 - 如果您想运行您的应用程序的控制台命令，您将需要使用正确的二进制文件（对于网络服务器也是如此）。但是，设置此设置将使您的 Composer 安装和更新更可预测，因此无论如何都值得这样做。

Composer & Plesk，遇到 PHP 版本问题

Composer & Plesk, encountering PHP version difficulties

php

laravel

composer-php

plesk

debian-stretch