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.';