Description:
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The data which was sent via POST, was truncated at the first occurrence of "&" Data following "&" was stripped off.

Reproduce code:
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First line of Data posted -
<?xml version="1.0" encoding="ISO-8859-1"?>
Line which caused problem 
<Company>M &amp; M International Trading</Company>

I have tried all the following but $_POST['upload'] does not contain complete data.

Maximum allowed post size is 8M in php.ini and post data is less than 1 MB
If special entities "&amp;"  were not present in the post data, everything works fine without any problem.
I am using PHP 5.0.5

Expected result:
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If special entities i.e. "&amp;"  were not present in the post data, everything works fine without any problem.

I haven't yet tested my code with POST data containing other special entities.

Actual result:
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Because of premature end of data, the following line of code fails:
$xml = simplexml_load_string($upload);