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(PECL haru >= 0.0.1)
HaruDoc::addPageLabel — Set the numbering style for the specified range of pages
$first_page 
   ,  int $style 
   ,  int $first_num 
   [,  string $prefix  = "" 
  ] )Set the numbering style for the specified range of pages.
first_page The first page included into the labeling range.
style The numbering style. The following values are allowed:
HaruPage::NUM_STYLE_DECIMAL  - page label is
         displayed using decimal numerals.
        HaruPage::NUM_STYLE_UPPER_ROMAN  - page label is
         displayed using uppercase Roman numerals.
        HaruPage::NUM_STYLE_LOWER_ROMAN  - page label is
         displayed using lowercase Roman numerals.
        HaruPage::NUM_STYLE_UPPER_LETTER  - page label is
         displayed using uppercase letters (from A to Z).
        HaruPage::NUM_STYLE_LOWER_LETTERS  - page label
         is displayed using lowercase letters (from a to z).
        first_num The first page number in this range.
prefix The prefix for the page label.
   Returns  TRUE  on success.
  
发生错误时抛出 HaruException 异常。