PHP正确的使用复数

 <?php
 // 正确地显示复数
 if(!function_exists('_plurals_format'))
 {
     /**
      * 正确的使用复数
      * @access   public
      * @author   zhaoyingnan   2016-02-17 11:53
      * @param    string        $sPluralName    非复数形式的名称
      * @param    int           $iAmount        数量
      * @return   string
      * @note
      **/
     function _plurals_format($sPluralName, $iAmount)
     {
         if(!$sPluralName || !is_numeric($iAmount) || $iAmount <= 0)
             return '';
         // 特殊的复数形式
         $arPluralName = array(
             'addendum'=>'addenda',
             'alga'=>'algae',
             'alumna'=>'alumnae',
             'alumnus'=>'alumni',
             'analysis'=>'analyses',
             'antenna'=>'antennas',//antennae
             'apparatus'=>'apparatuses',
             'appendix'=>'appendices',//appendixes
             'axis'=>'axes',
             'bacillus'=>'bacilli',
             'bacterium'=>'bacteria',
             'basis'=>'bases',
             'beau'=>'beaux',
             'bison'=>'bison',
             'buffalo'=>'buffalos',//buffaloes
             'bureau'=>'bureaus',
             'bus'=>'busses',//buses
             'cactus'=>'cactuses',//cacti
             'calf'=>'calves',
             'child'=>'children',
             'corps'=>'corps',
             'corpus'=>'corpora',//corpuses
             'crisis'=>'crises',
             'criterion'=>'criteria',
             'curriculum'=>'curricula',
             'datum'=>'data',
             'deer'=>'deer',
             'die'=>'dice',
             'dwarf'=>'dwarfs',//dwarves
             'diagnosis'=>'diagnoses',
             'echo'=>'echoes',
             'elf'=>'elves',
             'ellipsis'=>'ellipses',
             'embargo'=>'embargoes',
             'emphasis'=>'emphases',
             'erratum'=>'errata',
             'fireman'=>'firemen',
             'fish'=>'fish',//fishes
             'focus'=>'focuses',
             'foot'=>'feet',
             'formula'=>'formulas',
             'fungus'=>'fungi',//funguses
             'genus'=>'genera',
             'goose'=>'geese',
             'half'=>'halves',
             'hero'=>'heroes',
             'hippopotamus'=>'hippopotami',//hippopotamuses
             'hoof'=>'hoofs',//hooves
             'hypothesis'=>'hypotheses',
             'index'=>'indices',//indexes
             'knife'=>'knives',
             'leaf'=>'leaves',
             'life'=>'lives',
             'loaf'=>'loaves',
             'louse'=>'lice',
             'man'=>'men',
             'matrix'=>'matrices',
             'means'=>'means',
             'medium'=>'media',
             'memorandum'=>'memoranda',
             'millennium'=>'millenniums',//milennia
             'moose'=>'moose',
             'mosquito'=>'mosquitoes',
             'mouse'=>'mice',
             'nebula'=>'nebulae',//nebulas
             'neurosis'=>'neuroses',
             'nucleus'=>'nuclei',
             'oasis'=>'oases',
             'octopus'=>'octopi',//octopuses
             'ovum'=>'ova',
             'ox'=>'oxen',
             'paralysis'=>'paralyses',
             'parenthesis'=>'parentheses',
             'person'=>'people',
             'phenomenon'=>'phenomena',
             'potato'=>'potatoes',
             'radius'=>'radii',//radiuses
             'scarf'=>'scarfs',//scarves
             'self'=>'selves',
             'series'=>'series',
             'sheep'=>'sheep',
             'shelf'=>'shelves',
             'scissors'=>'scissors',
             'species'=>'species',
             'stimulus'=>'stimuli',
             'stratum'=>'strata',
             'syllabus'=>'syllabi',//syllabuses
             'symposium'=>'symposia',//symposiums
             'synthesis'=>'syntheses',
             'synopsis'=>'synopses',
             'tableau'=>'tableaux',
             'that'=>'those',
             'thesis'=>'theses',
             'thief'=>'thieves',
             'this'=>'these',
             'tomato'=>'tomatoes',
             'tooth'=>'teeth',
             'torpedo'=>'torpedoes',
             'vertebra'=>'vertebrae',
             'veto'=>'vetoes',
             'vita'=>'vitae',
             'watch'=>'watches',
             'wife'=>'wives',
             'wolf'=>'wolves',
             'woman'=>'women',
             'zero'=>'zeros',//zeroes
         );

         // 如果只有一个
         if($iAmount == 1)
             return $sPluralName;

         //　如果超过一个，并且是特殊的复数形式
         if(isset($arPluralName[$sPluralName]))
             return $arPluralName[$sPluralName];

         // 超过一个，并且是一个标准的复数形式
         return $sPluralName.'s';
     }
 }

 echo 'Sybil ate three '._plurals_format('biscuit', 3).', one after the other.',PHP_EOL;
 echo 'The two '._plurals_format('woman', 2).' will meet tomorrow in the final.';