Working with birthdays using Carbon

birthdays.php

<?php

/*
 * HOW TO TEST:
 * composer require illuminate/support nestbot/carbon fzaninotto/faker
 */

require 'vendor/autoload.php';
date_default_timezone_set('America/Sao_Paulo');
header('Content-Type: text/plain');

use Carbon\Carbon;

$is_birthday = function ($person) {
    return $person['birthday']->isBirthday();
};

$persons = collect(range(1, rand(1, 1000)))->map(function () {
    $random = Faker\Factory::create();

    return [
        'name' => $random->name,
        'birthday' => Carbon::parse($random->date),
    ];
});

$birthdays = $persons->filter($is_birthday);

$next_birthdays = $persons->reject($is_birthday)
    ->map(function ($person) {
        $person['birthday'] = $person['birthday']->copy()->year(Carbon::now()->year);

        if ($person['birthday']->isPast()) {
            $person['birthday'] = $person['birthday']->copy()->addYear();
        }

        return $person;
    })
    ->sortBy(function ($person) {
        return $person['birthday']->format('Y-m-d');
    });

if ($birthdays->count()) {
    print "Birthdays:\n\n";

    foreach ($birthdays as $person) {
        printf("%s => %s\n", $person['name'], $person['birthday']->age);
    }

    print "\n";
} else {
    print "No one is celebrating a birthday today. :/\n\n";
}

if ($next_birthdays->count()) {
    print "Next birthdays:\n\n";

    foreach ($next_birthdays as $person) {
        printf(
            "%s => %s (%s)\n",
            $person['name'],
            $person['birthday']->format('M d, Y'),
            $person['birthday']->diffForHumans()
        );
    }
}