Return character(s) for each position(s) to string

Character.php

<?php

use Illumniate\Support\Str;

if (! Str::hasMacro('character')) {
    Str::macro('character', static function ($value, $positions, $glue = '') {
        if (! is_array($positions)) {
            $positions = [$positions];
        }

        $result = '';

        foreach ($positions as $key => $position) {
            if ($key !== array_key_first($positions)) {
                $result .= $glue;
            }

            $result .= Str::substr($value, $position, 1);
        }

        return $result;
    });
}

if (! Str::hasMacro('char')) {
    Str::macro('char', static function ($value, $positions, $glue = '') {
        return Str::character($value, $positions, $glue);
    });
}