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How can I use getenv in PHP?

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I have written the following code: test.php

 $java_path=getenv("JAVA_HOME");
 echo 'Java Path : '.$java_path ."<br>";

when I run through command prompt (Ubuntu terminal) like:

>php test.php

Output: 
Java Path : /opt/jdk1.8.0_161

I get the expected output, but when I run it through browser (Firefox),

http://localhost/test.php

I get empty value for Java Path. Output: Java Path :

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