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How to define environment variables for each virtual host in apache 2.4 and use it in php

      2017/03/25

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Abstract

Hello everyone, It’s candle
This time I’ll show you how to define environment variables for each virtualhost in apache 2.4 and use it in php

For example, when you are developing with wordpress, you don’t want to put password or access key or anything else under the control of git.
So, you can define it on apache and require it with getenv for use.


Premise

apache2.4
anything php project
you have already built some kind of virtual host.

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Setting for environment variables

There is the apache configuration file in the following directory when you installed apache by brew.

/usr/local/etc/apache2/2.4/httpd.conf

Open this file and make sure that mod_env is enabled.

LoadModule env_module libexec/mod_env.so

You find out this line and comment out it.

commentinmodenv

Next, This is the sample virtual host.

alicelocal

In this , write environment variables as follows.
We will define an environment variable called HELLO_WORD.

<VirtualHost *:8080>
  ServerName alice.localhost
  DocumentRoot /Users/candle/apache/alice_blog
  SetEnv HELLO_WORD 'hello'

  <Directory "/Users/candle/apache/alice_blog">
    AllowOverride All
    Order allow,deny
    Allow from all
  </Directory>
</VirtualHost>

If you want to use the environment variables to below any directory, use .
In above sample, DocumentRoot is /Users/candle/apache/alice_blog, but if you want to use environment variable in under the all of apache directory, you write following.

<Directory "/Users/candle/apache">
  SetEnv GOOD_BYE 'bye'
</Directory>

Thne GOOD_BYE=’bye’ will be applied to /Users/candle/apache only when you access to alice.localhsot’s virtual host.
Apache configuration is finished.


using environment variables in php

You can be received apache environment variable with “getenv” or “$_SERVER”.

getenv('HELLO_WORD');
$_SERVER['HELLO_WORD']

Let’s display it.

You will create a file and try to receive environment variables.
The root directory is “/Users/candle/apache/alice_blog” in the above sample apache configuration.
You create info.php there.

touch /Users/candle/apache/alice_blog/info.php

Write this code.

<?php
echo "getenv: ".getenv('HELLO_WORD');
echo "<br />";
echo "SERVER: ".$_SERVER['HELLO_WORD'];
echo "<br />";
echo "ENV: ".$_ENV['HELLO_WORD'];
?>

echozaemon

Save it and access.

showenvdata-1

How is it? It probaly gets the environment variable by getenv and $_SERVER.


Conclusion

If you define environment variables for each virtual host, it is useful because you can change the value depending on the site that accesses even the same environment variable name.

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