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$Stack->hasPreviousPage()

Returns true if there are more results in the database than were included in the stack.

You can use this to generate paging links:

// is there a next page?
if ($posts->hasPreviousPage()) { 
  echo "Previous";
}

Or, you can just load the next page:

if ($posts->hasPreviousPage()) {
  $posts->getPreviousPage();
}
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