[statistics] remove unused variable
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@ -104,7 +104,6 @@ class Statistics extends Extension
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// Count changes made in each tag history and tally tags for users
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$tag_tally = [];
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foreach ($tag_histories as $i => $image) {
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$first = true;
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$prev = [];
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foreach ($image as $change) {
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$curr = explode(' ', $change['tags']);
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