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Reading Environment Variables in PHP
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Reading Environment Variables in PHP

InfinityCoder November 27, 2016

You want to get the value of an environment variable.

Use getenv():

1
$path = getenv('PATH');

Environment variables are named values associated with a process. For instance, in Unix, the value of getenv(‘HOME’) returns the home directory of a user:

1
print getenv('HOME'); // user's home directory

PHP automatically loads environment variables into $_ENV by default. However, php.inidevelopment and php.ini-production disables this because of speed considerations.
If you frequently access many environment variables, enable the $_ENV array by adding E to the variables_order configuration directive. Then you can read values from the $_ENV superglobal array. For instance:

1
$name = $_ENV['USER'];

The getenv() function isn’t available if you’re running PHP as an ISAPI module.

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