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    <p>I haven't tested this at all and I know it doesn't address points A or B, but there is some description of this issue in the comments in PHP documentation and some possible solutions for accessing these variables using <code>$_SERVER['VAR']</code>:</p> <p><a href="http://www.php.net/manual/en/reserved.variables.php#79811" rel="noreferrer">http://www.php.net/manual/en/reserved.variables.php#79811</a></p> <p><strong>EDIT</strong> - some more responses to the question offered:</p> <p><strong>A:</strong> The environment variables are renamed by Apache if they are involved in a redirect. For example, if you have the following rule:</p> <pre><code>RewriteRule ^index.php - [E=VAR1:'hello',E=VAR2:'world'] </code></pre> <p>Then you may access VAR1 and VAR2 using <code>$_SERVER['VAR1']</code> and <code>$_SERVER['VAR2']</code>. However, if you redirect the page like so:</p> <pre><code>RewriteRule ^index.php index2.php [E=VAR1:'hello',E=VAR2:'world'] </code></pre> <p>Then you must use <code>$_SERVER['REDIRECT_VAR1']</code>, etc.</p> <p><strong>B:</strong> The best way to overcome this issue is to process the variables that you're interested in using PHP. Create a function that runs through the <code>$_SERVER</code> array and finds the items that you need. You might even use a function like this:</p> <pre><code>function myGetEnv($key) { $prefix = "REDIRECT_"; if(array_key_exists($key, $_SERVER)) return $_SERVER[$key]; foreach($_SERVER as $k=&gt;$v) { if(substr($k, 0, strlen($prefix)) == $prefix) { if(substr($k, -(strlen($key))) == $key) return $v; } } return null; } </code></pre>
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    1. POWhen setting environment variables in Apache RewriteRule directives, what causes the variable name to be prefixed with "REDIRECT_"?
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    1. COThanks for the link to the comments. They confirm the issue and do provide a workaround but it just shifts the problem from PHP to extra code in the .htaccess I'm hoping an Apache guru might know how to make the name persist so no workaround code is needed! (I would give you +1 but don't have enough rep to do it)
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    2. CO@trowel - see changes to my answer
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    3. COThanks thetaiko, it transpires the renaming is a feature introduced in Apache 2.0, which is intended to help track variables through redirects. Nice PHP function but I'd probably go with a preg_match starting with /^($REDIRECT_)* to catch any number of redirects in one hit. At the apache end of things I've found a solution (added to question)
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