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@ 2019-02-06T02:03:39Z

<?php
function plural_to_singular($string)
{
    // quick return of "un-convertibles"
	if(preg_match('~^(?:[oó]culos|parab[eé]ns|f[eé]rias)$~iu', $string))
	{
		return $string;
	}
	
	$regex_config = [
        '~[õã]es$~iu' => 'ão',
        '~[áó].*eis$~iu' => 'el',
        '~[eé]is$~iu' => 'el',
        '~[^eé]\Kis$~iu' => 'l',
        '~ns$~iu' => 'm',
        '~eses$~iu' => 'ês',
        '~[rzs]\Kes$~iu' => '',
        '~s$~iu' => ''
	];

    return preg_replace(array_keys($regex_config), $regex_config, $string, 1); 
}

$words = array(
    'papéis' => 'papel',
    'anéis' => 'anel',
    'PASTEIS' => 'PASTEL',
    'CAMIÕES' => 'CAMIÃO',
    'rodas' => 'roda',
    'cães' => 'cão',
    'meses' => 'mês',
    'vezes' => 'vez',
    'luzes' => 'luz',
    'cristais' => 'cristal',
    'canções' => 'canção',
    'nuvens' => 'nuvem',
    'alemães' => 'alemão'
);

foreach($words as $plural => $singular)
{
    echo "$plural => $singular = " , plural_to_singular($plural) , "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: papéis => papel = papel anéis => anel = anel PASTEIS => PASTEL = PASTel CAMIÕES => CAMIÃO = CAMIão rodas => roda = roda cães => cão = cão meses => mês = mê vezes => vez = vez luzes => luz = luz cristais => cristal = cristal canções => canção = canção nuvens => nuvem = nuvem alemães => alemão = alemão

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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