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7 - Rules: how to create variable with PHP and $_SERVER['HTTP_REFERRER'] - Drupal Answers
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PHP Variables and Constants
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Set PHP Environment Variables Ubuntu - YouTube
silverstripe - In Php, how do I set the return type of a variable using inline type hinting - Stack Overflow
How to Set PHP Variable in JavaScript With Example | by Bikash Panda | Medium
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How to Set Global Variables in PHP - YouTube
