Description:
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DOMNode->nodeValue expects an xml-string. If a string containing an &-character in inputet, only the string be fore that character will be saved. If the string containg a xml entity, the &-character wille not be substituted with its entity but simply be written into the file. This thing worked as expected in PHP 5.0.x

Reproduce code:
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// In the example $myNode a DOMNode object, created from the following piece of xml: <node></node>

$myNode->nodeValue = "Me & You";
// Actual xml file: <node>Me </node>
// Expected xml file: <node>Me &amp; You</node>

$myNode->nodeValue ="Me &amp; You";
// Actual xml file: <node>Me &amp; You</node>
// Expected xml file: <node>Me &amp;amp; You</node>

$val = $myNode->nodeValue;
// Works as expected

$myNode->nodeValue = $myNode->nodeValue;
// This will change the content of <node>, if it contains "&"