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$dom->getElementsByTagName($key)->item(0)->nodeValue = (string) $value;

I have this line which throws this error. I am working with DOMDocument for years and never experienced this before. Actually I am testing the $dom before just to make sure it's all good like this:

if (gettype($dom) === "object") {
    if ($dom instanceof DOMDocument) {
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Is $dom->getElementsByTagName($key)->length>0? –  Passerby Feb 27 '13 at 3:39
    
The problem is solved. The $dom was an outdated version from memcached, which just needed to be read again from the file. My bad. –  iroybot Mar 1 '13 at 21:21

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