Laravel's env() helper

env.helper.php

<?php

/**
 * Gets the value of an environment variable. Supports boolean, empty and null.
 *
 * @param  string  $key
 * @param  mixed   $default
 * @return mixed
 */
function env($key, $default = null)
{
    $value = getenv($key);

    if ($value === false) {
        return value($default);
    }

    switch (strtolower($value)) {
        case "true":
        case "(true)":
            return true;

        case "false":
        case "(false)":
            return false;

        case "empty":
        case "(empty)":
            return "";

        case "null":
        case "(null)":
            return;
    }

    if (startsWith($value, '"') && endsWith($value, '"')) {
        return substr($value, 1, -1);
    }

    return $value;
}

/**
 * Return the default value of the given value.
 *
 * @param  mixed  $value
 * @return mixed
 */
function value($value, ...$args)
{
    return $value instanceof Closure ? $value(...$args) : $value;
}

/**
 * Determine if a given string starts with a given substring.
 *
 * @param  string  $haystack
 * @param  string|string[]  $needles
 * @return bool
 */
function startsWith($haystack, $needles)
{
    foreach ((array) $needles as $needle) {
        if ((string) $needle !== "" && str_starts_with($haystack, $needle)) {
            return true;
        }
    }

    return false;
}

/**
 * Determine if a given string ends with a given substring.
 *
 * @param  string  $haystack
 * @param  string|string[]  $needles
 * @return bool
 */
function endsWith($haystack, $needles)
{
    foreach ((array) $needles as $needle) {
        if ((string) $needle !== "" && str_ends_with($haystack, $needle)) {
            return true;
        }
    }

    return false;
}