xml - PHP changing the value of an svg node -

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i have huge svg file(https://gist.githubusercontent.com/anonymous/273dda3478d676ab1d5d/raw/gistfile1.xml) , want change value of each *. need loop through tspan nodes , gives me values of it, can compare them other value , change value of node. have tried lot, nothing worked me. can of can me working loop change tspan values?

why don't read xml , read token after token until find open tspan tag? can manipulate , save xml.

http://php.net/manual/de/class.domdocument.php


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