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[EDIT] FILE: EnglishInflector.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\String\Inflector;

final class EnglishInflector implements InflectorInterface
{
    /**
     * Map English plural to singular suffixes.
     *
     * @see http://english-zone.com/spelling/plurals.html
     */
    private const PLURAL_MAP = [
        // First entry: plural suffix, reversed
        // Second entry: length of plural suffix
        // Third entry: Whether the suffix may succeed a vowel
        // Fourth entry: Whether the suffix may succeed a consonant
        // Fifth entry: singular suffix, normal

// insignias (insigne), insignia (insigne)
        ['saingisni', 9, true, true, 'insigne'],
        ['aingisni', 8, true, true, 'insigne'],

// passersby (passerby)
        ['ybsressap', 9, true, true, 'passerby'],

// nodes (node)
        ['sedon', 5, true, true, 'node'],

// bacteria (bacterium)
        ['airetcab', 8, true, true, 'bacterium'],

// issues (issue)
        ['seussi', 6, true, true, 'issue'],

// corpora (corpus)
        ['aroproc', 7, true, true, 'corpus'],

// criteria (criterion)
        ['airetirc', 8, true, true, 'criterion'],

// curricula (curriculum)
        ['alucirruc', 9, true, true, 'curriculum'],

// quora (quorum)
        ['arouq', 5, true, true, 'quorum'],

// genera (genus)
        ['areneg', 6, true, true, 'genus'],

// media (medium)
        ['aidem', 5, true, true, 'medium'],

// memoranda (memorandum)
        ['adnaromem', 9, true, true, 'memorandum'],

// phenomena (phenomenon)
        ['anemonehp', 9, true, true, 'phenomenon'],

// strata (stratum)
        ['atarts', 6, true, true, 'stratum'],

// nebulae (nebula)
        ['ea', 2, true, true, 'a'],

// services (service)
        ['secivres', 8, true, true, 'service'],

// mice (mouse), lice (louse)
        ['eci', 3, false, true, 'ouse'],

// geese (goose)
        ['esee', 4, false, true, 'oose'],

// fungi (fungus), alumni (alumnus), syllabi (syllabus), radii (radius)
        ['i', 1, true, true, 'us'],

// men (man), women (woman)
        ['nem', 3, true, true, 'man'],

// children (child)
        ['nerdlihc', 8, true, true, 'child'],

// oxen (ox)
        ['nexo', 4, false, false, 'ox'],

// indices (index), appendices (appendix), prices (price)
        ['seci', 4, false, true, ['ex', 'ix', 'ice']],

// codes (code)
        ['sedoc', 5, false, true, 'code'],

// selfies (selfie)
        ['seifles', 7, true, true, 'selfie'],

// zombies (zombie)
        ['seibmoz', 7, true, true, 'zombie'],

// movies (movie)
        ['seivom', 6, true, true, 'movie'],

// names (name)
        ['seman', 5, true, false, 'name'],

// conspectuses (conspectus), prospectuses (prospectus)
        ['sesutcep', 8, true, true, 'pectus'],

// feet (foot)
        ['teef', 4, true, true, 'foot'],

// geese (goose)
        ['eseeg', 5, true, true, 'goose'],

// teeth (tooth)
        ['hteet', 5, true, true, 'tooth'],

// news (news)
        ['swen', 4, true, true, 'news'],

// series (series)
        ['seires', 6, true, true, 'series'],

// babies (baby)
        ['sei', 3, false, true, 'y'],

// accesses (access), addresses (address), kisses (kiss)
        ['sess', 4, true, false, 'ss'],

// statuses (status)
        ['sesutats', 8, true, true, 'status'],

// article (articles), ancle (ancles)
        ['sel', 3, true, true, 'le'],

// analyses (analysis), ellipses (ellipsis), fungi (fungus),
        // neuroses (neurosis), theses (thesis), emphases (emphasis),
        // oases (oasis), crises (crisis), houses (house), bases (base),
        // atlases (atlas)
        ['ses', 3, true, true, ['s', 'se', 'sis']],

// objectives (objective), alternative (alternatives)
        ['sevit', 5, true, true, 'tive'],

// drives (drive)
        ['sevird', 6, false, true, 'drive'],

// lives (life), wives (wife)
        ['sevi', 4, false, true, 'ife'],

// moves (move)
        ['sevom', 5, true, true, 'move'],

// hooves (hoof), dwarves (dwarf), elves (elf), leaves (leaf), caves (cave), staves (staff)
        ['sev', 3, true, true, ['f', 've', 'ff']],

// axes (axis), axes (ax), axes (axe)
        ['sexa', 4, false, false, ['ax', 'axe', 'axis']],

// indexes (index), matrixes (matrix)
        ['sex', 3, true, false, 'x'],

// quizzes (quiz)
        ['sezz', 4, true, false, 'z'],

// bureaus (bureau)
        ['suae', 4, false, true, 'eau'],

// fees (fee), trees (tree), employees (employee)
        ['see', 3, true, true, 'ee'],

// edges (edge)
        ['segd', 4, true, true, 'dge'],

// outages (outage) - specific fix to avoid 'outag'
        ['segatuo', 7, true, true, 'outage'],

// traces (trace), faces (face), places (place), pieces (piece)
        ['sec', 3, true, true, 'ce'],

// roses (rose), garages (garage), cassettes (cassette),
        // waltzes (waltz), heroes (hero), bushes (bush), arches (arch),
        // shoes (shoe)
        ['se', 2, true, true, ['', 'e']],

// status (status)
        ['sutats', 6, true, true, 'status'],

// tags (tag)
        ['s', 1, true, true, ''],

// chateaux (chateau)
        ['xuae', 4, false, true, 'eau'],

// people (person)
        ['elpoep', 6, true, true, 'person'],
    ];

/**
     * Map English singular to plural suffixes.
     *
     * @see http://english-zone.com/spelling/plurals.html
     */
    private const SINGULAR_MAP = [
        // First entry: singular suffix, reversed
        // Second entry: length of singular suffix
        // Third entry: Whether the suffix may succeed a vowel
        // Fourth entry: Whether the suffix may succeed a consonant
        // Fifth entry: plural suffix, normal

// passerby (passersby)
        ['ybressap', 8, true, true, 'passersby'],

// insigne (insignia, insignias)
        ['engisni', 7, true, true, ['insignia', 'insignias']],

// nodes (node)
        ['edon', 4, true, true, 'nodes'],

// axes (axis)
        ['sixa', 4, false, false, 'axes'],

// criterion (criteria)
        ['airetirc', 8, false, false, 'criterion'],

// nebulae (nebula)
        ['aluben', 6, false, false, 'nebulae'],

// children (child)
        ['dlihc', 5, true, true, 'children'],

// prices (price)
        ['eci', 3, false, true, 'ices'],

// services (service)
        ['ecivres', 7, true, true, 'services'],

// lives (life), wives (wife)
        ['efi', 3, false, true, 'ives'],

// selfies (selfie)
        ['eifles', 6, true, true, 'selfies'],

// movies (movie)
        ['eivom', 5, true, true, 'movies'],

// lice (louse)
        ['esuol', 5, false, true, 'lice'],

// mice (mouse)
        ['esuom', 5, false, true, 'mice'],

// geese (goose)
        ['esoo', 4, false, true, 'eese'],

// houses (house), bases (base)
        ['es', 2, true, true, 'ses'],

// geese (goose)
        ['esoog', 5, true, true, 'geese'],

// caves (cave)
        ['ev', 2, true, true, 'ves'],

// drives (drive)
        ['evird', 5, false, true, 'drives'],

// objectives (objective), alternative (alternatives)
        ['evit', 4, true, true, 'tives'],

// moves (move)
        ['evom', 4, true, true, 'moves'],

// staves (staff)
        ['ffats', 5, true, true, 'staves'],

// hooves (hoof), dwarves (dwarf), elves (elf), leaves (leaf)
        ['ff', 2, true, true, 'ffs'],

// hooves (hoof), dwarves (dwarf), elves (elf), leaves (leaf)
        ['f', 1, true, true, ['fs', 'ves']],

// arches (arch)
        ['hc', 2, true, true, 'ches'],

// bushes (bush)
        ['hs', 2, true, true, 'shes'],

// teeth (tooth)
        ['htoot', 5, true, true, 'teeth'],

// albums (album)
        ['mubla', 5, true, true, 'albums'],

// quorums (quorum)
        ['murouq', 6, true, true, ['quora', 'quorums']],

// bacteria (bacterium), curricula (curriculum), media (medium), memoranda (memorandum), phenomena (phenomenon), strata (stratum)
        ['mu', 2, true, true, 'a'],

// men (man), women (woman)
        ['nam', 3, true, true, 'men'],

// people (person)
        ['nosrep', 6, true, true, ['persons', 'people']],

// criteria (criterion)
        ['noiretirc', 9, true, true, 'criteria'],

// phenomena (phenomenon)
        ['nonemonehp', 10, true, true, 'phenomena'],

// echoes (echo)
        ['ohce', 4, true, true, 'echoes'],

// heroes (hero)
        ['oreh', 4, true, true, 'heroes'],

// atlases (atlas)
        ['salta', 5, true, true, 'atlases'],

// aliases (alias)
        ['saila', 5, true, true, 'aliases'],

// irises (iris)
        ['siri', 4, true, true, 'irises'],

// analyses (analysis), ellipses (ellipsis), neuroses (neurosis)
        // theses (thesis), emphases (emphasis), oases (oasis),
        // crises (crisis)
        ['sis', 3, true, true, 'ses'],

// accesses (access), addresses (address), kisses (kiss)
        ['ss', 2, true, false, 'sses'],

// syllabi (syllabus)
        ['suballys', 8, true, true, 'syllabi'],

// buses (bus)
        ['sub', 3, true, true, 'buses'],

// circuses (circus)
        ['suc', 3, true, true, 'cuses'],

// hippocampi (hippocampus)
        ['supmacoppih', 11, false, false, 'hippocampi'],

// campuses (campus)
        ['sup', 3, true, true, 'puses'],

// status (status)
        ['sutats', 6, true, true, ['status', 'statuses']],

// conspectuses (conspectus), prospectuses (prospectus)
        ['sutcep', 6, true, true, 'pectuses'],

// nexuses (nexus)
        ['suxen', 5, false, false, 'nexuses'],

// fungi (fungus), alumni (alumnus), syllabi (syllabus), radii (radius)
        ['su', 2, true, true, 'i'],

// news (news)
        ['swen', 4, true, true, 'news'],

// feet (foot)
        ['toof', 4, true, true, 'feet'],

// chateaux (chateau), bureaus (bureau)
        ['uae', 3, false, true, ['eaus', 'eaux']],

// oxen (ox)
        ['xo', 2, false, false, 'oxen'],

// hoaxes (hoax)
        ['xaoh', 4, true, false, 'hoaxes'],

// indices (index)
        ['xedni', 5, false, true, ['indicies', 'indexes']],

// fax (faxes, faxxes)
        ['xaf', 3, true, true, ['faxes', 'faxxes']],

// boxes (box)
        ['xo', 2, false, true, 'oxes'],

// indexes (index), matrixes (matrix), appendices (appendix)
        ['x', 1, true, false, ['ces', 'xes']],

// babies (baby)
        ['y', 1, false, true, 'ies'],

// quizzes (quiz)
        ['ziuq', 4, true, false, 'quizzes'],

// waltzes (waltz)
        ['z', 1, true, true, 'zes'],
    ];

/**
     * A list of words which should not be inflected, reversed.
     */
    private const UNINFLECTED = [
        '',

// data
        'atad',

// deer
        'reed',

// equipment
        'tnempiuqe',

// feedback
        'kcabdeef',

// fish
        'hsif',

// health
        'htlaeh',

// history
        'yrotsih',

// info
        'ofni',

// information
        'noitamrofni',

// money
        'yenom',

// moose
        'esoom',

// series
        'seires',

// sheep
        'peehs',

// species
        'seiceps',

// traffic
        'ciffart',

// aircraft
        'tfarcria',

// hardware
        'erawdrah',
    ];

public function singularize(string $plural): array
    {
        $pluralRev = strrev($plural);
        $lowerPluralRev = strtolower($pluralRev);
        $pluralLength = \strlen($lowerPluralRev);

// Check if the word is one which is not inflected, return early if so
        if (\in_array($lowerPluralRev, self::UNINFLECTED, true)) {
            return [$plural];
        }

// The outer loop iterates over the entries of the plural table
        // The inner loop $j iterates over the characters of the plural suffix
        // in the plural table to compare them with the characters of the actual
        // given plural suffix
        foreach (self::PLURAL_MAP as $map) {
            $suffix = $map[0];
            $suffixLength = $map[1];
            $j = 0;

// Compare characters in the plural table and of the suffix of the
            // given plural one by one
            while ($suffix[$j] === $lowerPluralRev[$j]) {
                // Let $j point to the next character
                ++$j;

// Successfully compared the last character
                // Add an entry with the singular suffix to the singular array
                if ($j === $suffixLength) {
                    // Is there any character preceding the suffix in the plural string?
                    if ($j < $pluralLength) {
                        $nextIsVowel = str_contains('aeiou', $lowerPluralRev[$j]);

if (!$map[2] && $nextIsVowel) {
                            // suffix may not succeed a vowel but next char is one
                            break;
                        }

if (!$map[3] && !$nextIsVowel) {
                            // suffix may not succeed a consonant but next char is one
                            break;
                        }
                    }

$newBase = substr($plural, 0, $pluralLength - $suffixLength);
                    $newSuffix = $map[4];

// Check whether the first character in the plural suffix
                    // is uppercased. If yes, uppercase the first character in
                    // the singular suffix too
                    $firstUpper = ctype_upper($pluralRev[$j - 1]);

if (\is_array($newSuffix)) {
                        $singulars = [];

foreach ($newSuffix as $newSuffixEntry) {
                            $singulars[] = $newBase.($firstUpper ? ucfirst($newSuffixEntry) : $newSuffixEntry);
                        }

return $singulars;
                    }

return [$newBase.($firstUpper ? ucfirst($newSuffix) : $newSuffix)];
                }

// Suffix is longer than word
                if ($j === $pluralLength) {
                    break;
                }
            }
        }

// Assume that plural and singular is identical
        return [$plural];
    }

public function pluralize(string $singular): array
    {
        $singularRev = strrev($singular);
        $lowerSingularRev = strtolower($singularRev);
        $singularLength = \strlen($lowerSingularRev);

// Check if the word is one which is not inflected, return early if so
        if (\in_array($lowerSingularRev, self::UNINFLECTED, true)) {
            return [$singular];
        }

// The outer loop iterates over the entries of the singular table
        // The inner loop $j iterates over the characters of the singular suffix
        // in the singular table to compare them with the characters of the actual
        // given singular suffix
        foreach (self::SINGULAR_MAP as $map) {
            $suffix = $map[0];
            $suffixLength = $map[1];
            $j = 0;

// Compare characters in the singular table and of the suffix of the
            // given plural one by one

while ($suffix[$j] === $lowerSingularRev[$j]) {
                // Let $j point to the next character
                ++$j;

// Successfully compared the last character
                // Add an entry with the plural suffix to the plural array
                if ($j === $suffixLength) {
                    // Is there any character preceding the suffix in the plural string?
                    if ($j < $singularLength) {
                        $nextIsVowel = str_contains('aeiou', $lowerSingularRev[$j]);

if (!$map[2] && $nextIsVowel) {
                            // suffix may not succeed a vowel but next char is one
                            break;
                        }

$newBase = substr($singular, 0, $singularLength - $suffixLength);
                    $newSuffix = $map[4];

// Check whether the first character in the singular suffix
                    // is uppercased. If yes, uppercase the first character in
                    // the singular suffix too
                    $firstUpper = ctype_upper($singularRev[$j - 1]);

if (\is_array($newSuffix)) {
                        $plurals = [];

foreach ($newSuffix as $newSuffixEntry) {
                            $plurals[] = $newBase.($firstUpper ? ucfirst($newSuffixEntry) : $newSuffixEntry);
                        }

return $plurals;
                    }

return [$newBase.($firstUpper ? ucfirst($newSuffix) : $newSuffix)];
                }

// Suffix is longer than word
                if ($j === $singularLength) {
                    break;
                }
            }
        }

// Assume that plural is singular with a trailing `s`
        return [$singular.'s'];
    }
}

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