php functions to get gender

gender.php

<?php

define('GENDER_MALE', 'm');
define('GENDER_MALE_FULL', 'male');
define('GENDER_FEMALE', 'f');
define('GENDER_FEMALE_FULL', 'female');
define('GENDER_UNKNOWN', 'u');
define('GENDER_UNKNOWN_FULL', 'unknown');

function isValidGender($gender)
{
    $gender = strtolower($gender);

    $accepted_values = array(
        GENDER_MALE,
        GENDER_MALE_FULL,
        GENDER_FEMALE,
        GENDER_FEMALE_FULL,
        GENDER_UNKNOWN,
        GENDER_UNKNOWN_FULL
    );

    foreach ($accepted_values as $value) {
        if ($gender == strtolower($value)) {
            return true;
        }
    }

    return false;
}

function useGenderShortForm($gender)
{
    if ($gender == GENDER_MALE_FULL) {
        $gender = GENDER_MALE;
    } else if ($gender == GENDER_FEMALE_FULL) {
        $gender = GENDER_FEMALE;
    } else if ($gender == GENDER_UNKNOWN_FULL) {
        $gender = GENDER_UNKNOWN;
    } else {

    }

    return $gender;
}

function getGenderLongForm($gender)
{
    if ($gender == GENDER_MALE) {
        $gender = GENDER_MALE_FULL;
    } else if ($gender == GENDER_FEMALE) {
        $gender = GENDER_FEMALE_FULL;
    } else if ($gender == GENDER_UNKNOWN) {
        $gender = GENDER_UNKNOWN_FULL;
    } else {

    }

    return $gender;
}

And how does it work?

Everything works fine for me

thanks

Written programs can help in the future. There are many more issues related to gender. I recently researched gender pay gap, used https://papersowl.com/examples/gender-pay-gap/ for this. I can say that this problem really exists, it is one of the main ones worth fighting. It is necessary, ideally, to make sure that everywhere in all areas of law between a woman and a man there are 50 to 50.