Pluralize or depularize

Inflector.php

<?php
/**
* Inflector for pluralize and singularize English nouns.
*
* This Inflector is a port of Ruby on Rails Inflector.
*
* It can be really helpful for developers that want to
* create frameworks based on naming conventions rather than
* configurations.
*
*/

class Inflector{
	function pluralize($word){
		$plural = array(
			'/(quiz)$/i' => '1zes',
			'/^(ox)$/i' => '1en',
			'/([m|l])ouse$/i' => '1ice',
			'/(matr|vert|ind)ix|ex$/i' => '1ices',
			'/(x|ch|ss|sh)$/i' => '1es',
			'/([^aeiouy]|qu)ies$/i' => '1y',
			'/([^aeiouy]|qu)y$/i' => '1ies',
			'/(hive)$/i' => '1s',
			'/(?:([^f])fe|([lr])f)$/i' => '12ves',
			'/sis$/i' => 'ses',
			'/([ti])um$/i' => '1a',
			'/(buffal|tomat)o$/i' => '1oes',
			'/(bu)s$/i' => '1ses',
			'/(alias|status)/i'=> '1es',
			'/(octop|vir)us$/i'=> '1i',
			'/(ax|test)is$/i'=> '1es',
			'/s$/i'=> 's',
			'/$/'=> 's'
		);
		
		$uncountable = array('equipment', 'information', 'rice', 'money', 'species', 'series', 'fish', 'sheep');
		
		$irregular = array(
			'person' => 'people',
			'man' => 'men',
			'child' => 'children',
			'sex' => 'sexes',
			'move' => 'moves'
		);
		
		$lowercased_word = strtolower($word);
		
		foreach ($uncountable as $_uncountable){
			if(substr($lowercased_word,(-1*strlen($_uncountable))) == $_uncountable){
				return $word;
			}
		}
		
		foreach ($irregular as $_plural=> $_singular){
			if (preg_match('/('.$_plural.')$/i', $word, $arr)) {
				return preg_replace('/('.$_plural.')$/i', substr($arr[0],0,1).substr($_singular,1), $word);
			}
		}
		
		foreach ($plural as $rule => $replacement) {
			if (preg_match($rule, $word)) {
				return preg_replace($rule, $replacement, $word);
			}
		}
		return false;
	}
	
	function singularize($word){
		$singular = array (
			'/(quiz)zes$/i' => '\1',
			'/(matr)ices$/i' => '\1ix',
			'/(vert|ind)ices$/i' => '\1ex',
			'/^(ox)en/i' => '\1',
			'/(alias|status)es$/i' => '\1',
			'/([octop|vir])i$/i' => '\1us',
			'/(cris|ax|test)es$/i' => '\1is',
			'/(shoe)s$/i' => '\1',
			'/(o)es$/i' => '\1',
			'/(bus)es$/i' => '\1',
			'/([m|l])ice$/i' => '\1ouse',
			'/(x|ch|ss|sh)es$/i' => '\1',
			'/(m)ovies$/i' => '\1ovie',
			'/(s)eries$/i' => '\1eries',
			'/([^aeiouy]|qu)ies$/i' => '\1y',
			'/([lr])ves$/i' => '\1f',
			'/(tive)s$/i' => '\1',
			'/(hive)s$/i' => '\1',
			'/([^f])ves$/i' => '\1fe',
			'/(^analy)ses$/i' => '\1sis',
			'/((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/i' => '\1\2sis',
			'/([ti])a$/i' => '\1um',
			'/(n)ews$/i' => '\1ews',
			'/s$/i' => '',
		);
		
		$uncountable = array('equipment', 'information', 'rice', 'money', 'species', 'series', 'fish', 'sheep');
		
		$irregular = array(
			'person' => 'people',
			'man' => 'men',
			'child' => 'children',
			'sex' => 'sexes',
			'move' => 'moves'
		);
		
		$lowercased_word = strtolower($word);
		foreach ($uncountable as $_uncountable){
			if(substr($lowercased_word,(-1*strlen($_uncountable))) == $_uncountable){
				return $word;
			}
		}
		
		foreach ($irregular as $_plural=> $_singular){
			if (preg_match('/('.$_singular.')$/i', $word, $arr)) {
				return preg_replace('/('.$_singular.')$/i', substr($arr[0],0,1).substr($_plural,1), $word);
			}
		}
		
		foreach ($singular as $rule => $replacement) {
			if (preg_match($rule, $word)) {
				return preg_replace($rule, $replacement, $word);
			}
		}
		
		return $word;
	}
	
	function titleize($word, $uppercase = ''){
		$uppercase = $uppercase == 'first' ? 'ucfirst' : 'ucwords';
		return $uppercase(Inflector::humanize(Inflector::underscore($word)));
	}
	
	function camelize($word){
		return str_replace(' ','',ucwords(preg_replace('/[^A-Z^a-z^0-9]+/',' ',$word)));
	}
	
	function underscore($word){
		return  strtolower(preg_replace('/[^A-Z^a-z^0-9]+/','_',
		preg_replace('/([a-zd])([A-Z])/','1_2',
		preg_replace('/([A-Z]+)([A-Z][a-z])/','1_2',$word))));
	}
	
	function humanize($word, $uppercase = ''){
		$uppercase = $uppercase == 'all' ? 'ucwords' : 'ucfirst';
		return $uppercase(str_replace('_',' ',preg_replace('/_id$/', '',$word)));
	}
	
	function variablize($word){
		$word = Inflector::camelize($word);
		return strtolower($word[0]).substr($word,1);
	}
	

	function tableize($class_name){
		return Inflector::pluralize(Inflector::underscore($class_name));
	}
	
	function classify($table_name){
		return Inflector::camelize(Inflector::singularize($table_name));
	}
	
	function ordinalize($number){
		if (in_array(($number % 100),range(11,13))){
			return $number.'th';
		}else{
			switch (($number % 10)) {
				case 1:
					return $number.'st';	break;
				case 2:
					return $number.'nd';	break;
				case 3:
					return $number.'rd';	break;
				default:
					return $number.'th';	break;
			}
		}
	}
}

//	Usage Examples

/* Singular to plural / Plural to singular */

echo Inflector::pluralize('search'); // outputs searches
echo Inflector::singularize('cases'); // outputs case
echo Inflector::pluralize('query'); // outputs queries
echo Inflector::singularize('queries'); // outputs query
echo Inflector::pluralize('ability'); // outputs abilities
echo Inflector::singularize('abilities'); // outputs ability
echo Inflector::pluralize('analysis'); // outputs analyses
echo Inflector::singularize('analyses'); // outputs analysis
echo Inflector::pluralize('information'); // outputs information
echo Inflector::singularize('information'); // outputs information
echo Inflector::pluralize('mouse'); // outputs mice
echo Inflector::singularize('mice'); // outputs mouse

/* CamelCase to underscore / underscore to CamelCase */

echo Inflector::underscore('SpecialGuest'); // outputs special_guest
echo Inflector::camelize('special_guest'); // outputs SpecialGuest
echo Inflector::underscore('FreeBSD'); // outputs free_bsd
echo Inflector::camelize('free_bsd'); // outputs FreeBsd
echo Inflector::underscore('HTML'); // outputs html
echo Inflector::camelize('html'); // outputs Html

/* Underscore to "human-text" / "Human-text" to Underscore */

echo Inflector::humanize('employee_salary'); // outputs Employee salary
echo Inflector::underscore('Employee salary'); // outputs employee_salary

/* Examples of titleize() */

echo Inflector::titleize('ActiveRecord'); // outputs Active Record
echo Inflector::titleize('action web service'); // outputs Action Web Service

/* Examples of ordinalize() */

echo Inflector::ordinalize(1); // outputs 1st
echo Inflector::ordinalize(2); // outputs 2nd
echo Inflector::ordinalize(3); // outputs 3rd
echo Inflector::ordinalize(4); // outputs 4th
echo Inflector::ordinalize(5); // outputs 5th
echo Inflector::ordinalize(20); // outputs 20th
echo Inflector::ordinalize(21); // outputs 21st