Change a value in a XML document with SimpleXML in PHP

Question

I have a XML file which I want to replace a value with a constant when it is empty, checking an attribute (annotation_ref). The XML tags are something like this:

 <ANNOTATION> <REF_ANNOTATION ANNOTATION_ID="id" ANNOTATION_REF="1234"> <ANNOTATION_VALUE></ANNOTATION_VALUE> </REF_ANNOTATION> </ANNOTATION>

So, the result of the transformation would be:

 <ANNOTATION> <REF_ANNOTATION ANNOTATION_ID="id" ANNOTATION_REF="1234"> <ANNOTATION_VALUE>my_constant</ANNOTATION_VALUE> </REF_ANNOTATION> </ANNOTATION>

But instead of that, I get this:

 <ANNOTATION> <REF_ANNOTATION ANNOTATION_ID="id" ANNOTATION_REF="1234"> <ANNOTATION_VALUE/> </REF_ANNOTATION> <ANNOTATION_VALUE>my_constant</ANNOTATION_VALUE></ANNOTATION>

My code is the next:

$document = simplexml_load_file("my_document.eaf"); $aux = $annotation_document->ANNOTATION; foreach ($aux as $aux2) { if ($aux2->REF_ANNOTATION->attributes()->ANNOTATION_REF == $my_condition) { $aux2->ANNOTATION_VALUE = $my_constant; } }

Thank you so much.

Marc B · Accepted Answer · 2015-07-17 15:02:55Z

You're talking to the wrong node:

if ($aux2->REF_ANNOTATION->attributes()->ANNOTATION_REF == $my_condition) { ^^^^^^^^^^^^^^^^^^ $aux2->ANNOTATION_VALUE = $my_constant; ^^^^^^^^^^^^

You should have

$aux2->REF_ANNOTATION->ANNOTATION_VALUE = $my_constant;

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