env_loader.php

<?php
/**
 * Simple .env loader. Parses KEY=VALUE pairs and stores them in environment.
 */
if (!function_exists('loadEnv')) {
    function loadEnv(string $filePath, bool $overwrite = false): void
    {
        if (!is_file($filePath) || !is_readable($filePath)) {
            return;
        }

        $lines = file($filePath, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        if ($lines === false) {
            return;
        }

        foreach ($lines as $line) {
            $line = trim($line);
            if ($line === '' || $line[0] === '#' || strpos($line, '=') === false) {
                continue;
            }

            [$key, $value] = explode('=', $line, 2);
            $key = trim($key);
            $value = trim($value);

            if ($key === '') {
                continue;
            }

            if ((str_starts_with($value, '"') && str_ends_with($value, '"')) || (str_starts_with($value, "'") && str_ends_with($value, "'"))) {
                $value = substr($value, 1, -1);
            }

            $current = getenv($key);
            if ($current !== false && !$overwrite) {
                continue;
            }

            putenv(sprintf('%s=%s', $key, $value));
            $_ENV[$key] = $value;
            $_SERVER[$key] = $value;
        }
    }
}