format .xml - percentage change, class green and red -

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format .xml - percentage change, class green and red -

i have little problem. import percentage alter companies .xml format file.

how can create function: - if percentage alter not "-" add together class="green" - if "-" add together class ="red"?

my code:

<?php print $percentagechange; ?>

result:

example: -2,50%

xml format percentage

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