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copied!<p>I think by declaring <code>$_POST</code> as an input parameter of the function, you've redefined it in the local scope and lost the global data because you try to re-assing it (<a href="http://php.net/language.variables.superglobals" rel="nofollow noreferrer"><code>$_POST</code> is a superglobal</a>). For what you've done, some good existing Q&A material are:</p> <ul> <li><a href="https://stackoverflow.com/q/1354691/367456">PHP: $_GET and $_POST in functions? (Aug 2009)</a></li> <li><a href="https://stackoverflow.com/q/1660912/367456">passing POST array to php function (Nov 2009)</a></li> </ul> <p>Even those are older, the information they give about the topic are still valid in PHP because those <em>superglobals</em> haven't changed meanings over the years.</p> <p>However in all <em>current</em> stable PHP Versions (that is PHP 5.4 and up) your code produces a fatal error (<a href="http://3v4l.org/aiYXR" rel="nofollow noreferrer">Online Demo in 80+ PHP Versions</a>):</p> <blockquote> <p>Fatal error: Cannot re-assign auto-global variable _POST</p> </blockquote> <p>This might explain that you don't get any output. See <a href="https://stackoverflow.com/questions/12769982/reference-what-does-this-error-mean-in-php/12772851#12772851"><em>Nothing is seen. The page is empty and white. (also known as White Page or Screen Of Death)</em></a> in the <a href="https://stackoverflow.com/q/12769982/367456">Reference - What does this error mean in PHP?</a>. You might not see any error message because you don't display it or you don't look into the log-file, see <a href="https://stackoverflow.com/q/845021/367456">How to get useful error messages in PHP?</a>.</p> <p>So what can you do? Next to understanding the basics of PHP error handling - and I suggest you to enable error logging and locate the error log to get fluent with it - you need to change the code as outlined in the two reference questions linked above.</p> <p>Either get rid of <code>$_POST</code> as an input to the function, or change the name to something else like <code>$postData</code>.</p> <pre><code>function call(array $postData) { $xml = $postData['xml']; $doc = simplexml_load_string($xml); } </code></pre> <p>The just call the function with:</p> <pre><code>call($_POST); </code></pre> <p>Or if you only pass some little parameters with that array, write them out:</p> <pre><code>function call($xmlString) { $doc = simplexml_load_string($xmlString); } </code></pre> <p>Usage:</p> <pre><code>call($_POST['xml']); </code></pre> <p>This will allow you to use different form names with the same code. Very useful because you don't tie things too hard together but leave some wiggling room.</p>

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