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问题:

I want to show an env var in my docker container. The PHP script looks like this:

<html>
 <head>
  <title>Show Use of environment variables</title>
 </head>
 <body>
  <?php
  print "env is: ".$_ENV["USER"]."\n";
  ?>
 </body>
</html>

I use OpenShift to start the container. The PHP - container shows:

env is:

Now I change the dc config of my container:

oc env dc/envar USER=Pieter
deploymentconfig "envar" updated

When I access the container. The env var of USER is Pieter

docker exec -it 44a0f446ae36 bash
bash-4.2$ echo $USER
Pieter

But my script remains showing: "env is:" It does not fill in the variable.

回答1:

Change

print "env is: ".$_ENV["USER"]."\n";

print "env is: ".getenv("USER")."\n";

/# cat test.php
<html>
 <head>
  <title>Show Use of environment variables</title>
 </head>
 <body>
  <?php
  print "env via \$_ENV is: ".$_ENV["USER"]."\n";
  print "env via getenv is: ".getenv("USER")."\n";
  ?>
 </body>
</html>
/ #
/ # export USER=Sascha
/ # echo $USER
Sascha
/ # php test.php 
<html>
 <head>
  <title>Show Use of environment variables</title>
 </head>
 <body>
  PHP Notice:  Array to string conversion in /test.php on line 7
PHP Notice:  Undefined index: USER in /test.php on line 7
env via $_ENV is: 
env via getenv is: Sascha
 </body>
</html>
/ #

回答2:

I did the following to solve this issue:

Use this command that writes the environment variables to a file called .env in your project folder.
```
CMD ["env >> /path/to/project/.env"]
```
Install dotenv package that loads the env variables from a file to $_ENV
```
composer require vlucas/phpdotenv
```

Load the package and use it as

require 'vendor/autoload.php'
$dotenv = new Dotenv\Dotenv(__DIR__);
$dotenv->load();
getenv('VAR_NAME');

Hope it helps.

Environment variable in PHP-docker container

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Environment variable in PHP-docker container

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