安装gd扩展失败

Question

我正在尝试在gd (或下-gd)库上安装heroku。

当我尝试使用composer安装它们时(我有如下所示)

{
    "name": "cool/app",
    "type": "project",
    "require": {
        "ext-gd": "dev-master" (tried also installing "gd":"*", "ext-gd" : "*")
    },
    "license": "2016",
    "authors": [
        {
            "name": "Dario",
            "email": "my@email.it"
        }
    ],
    "minimum-stability": "dev"
}

我得到了

Problem 1
- The requested PHP extension ext-gd * is missing from your system. Install or enable PHP's gd extension.

所以，尝试从apt-get (sudo apt-get install php7-gd)安装，但我没有sudo权限，因为我不知道根heroku密码。

在这方面有什么工作吗？

编辑

为了更好地解释我所做的事情，下面是整个命令列表

$ heroku run bash
Running bash on ⬢ app... up, run.1644 (Free)
~ $ composer init


  Welcome to the Composer config generator  



This command will guide you through creating your composer.json config.

Package name (<vendor>/<name>) [app/app]: 
Description []: 
Author [, n to skip]: n
Minimum Stability []: 
Package Type (e.g. library, project, metapackage, composer-plugin) []: 
License []: 

Define your dependencies.

Would you like to define your dependencies (require) interactively [yes]? 
Search for a package: ext-gd

Found 15 packages matching ext-gd

   [0] stil/gd-text
   [1] gd/plesk-bundle
   [2] quince/persian-gd
   [3] xepan/gd-text
   [4] zgldh/gd-text-for-chinese
   [5] ext-calendar
   [6] ext-iconv
   [7] ext-dbus
   [8] ext-xml
   [9] ext-opendkim
  [10] ext-mcrypt
  [11] ext-openssl
  [12] ext-ssh2
  [13] ext-mongo
  [14] ext-mbstring

Enter package # to add, or the complete package name if it is not listed: ext-gd
Enter the version constraint to require (or leave blank to use the latest version): *
Search for a package: 
Would you like to define your dev dependencies (require-dev) interactively [yes]? no

{
    "name": "u11706/app",
    "require": {
        "ext-gd": "*"
    }
}

Do you confirm generation [yes]? 
~ $ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested PHP extension ext-gd * is missing from your system. Install or enable PHP's gd extension.

~ $ composer update --ignore-platform-reqs
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Writing lock file
Generating autoload files

我无法使用gd库作为php (Laravel)，Call to undefined function App\Http\Controllers\imagecreatefrompng()说

如果我在本地计算机上运行composer require ext-gd，就会得到

Using version ^0.0.0 for ext-gd
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Writing lock file
Generating autoload files

Answer 1

首先，您必须在本地绑定php。

1.步骤包括在composer.json中

{
  "require": {
      ..
      "ext-gd": "*",
      ...
   }
}

2.步骤更新编写器

composer update

这需要一杯time....take咖啡。

3.使用heroku cli进行步骤发布

git push heroku master

注意输出，检查你是否有类似于我下面第5行的东西，如果你有，一切都是正确的。

1. remote: -----> PHP app detected
2. remote: -----> Bootstrapping...
3. remote: -----> Installing platform packages...
4. remote:        - php (7.3.6)
5. remote:        - ext-gd (bundled with php)
6. remote:        - apache (2.4.39)
7. remote:        - nginx (1.16.0)
8. remote: -----> Installing dependencies...

编码愉快。

Answer 2

这并不是真正的Heroku问题，而是您的本地计算机的问题。

您正在本地运行composer update以重新生成composer.lock。您的composer.json包含对ext-gd的要求，因此本地计算机的PHP必须启用该扩展，否则需求无法满足，Composer就会抛出一个错误。

这种确切的情况，以及如何解决这个问题，将在https://devcenter.heroku.com/articles/php-support#using-optional-extensions上解释

Answer 3

gd在Heroku上是可用的，您必须通过将下面的行添加到composer.json (在require部分下)来启用它。

"ext-gd": "*"

在将代码推到heroku之前，请确保在本地运行composer update，否则它将无法工作。