ParseEnv.php

<?php
class ParseEnv
{
  protected $path;

  public function __construct(string $path)
  {
    if (!file_exists($path))
    {
      throw new \InvalidArgumentException(sprintf('%s doesn\'t exist', $path));
    }

    $this->path = $path;
  }

  public function load() :void
  {
    if (!is_readable($this->path))
    {
      throw new \RuntimeException(sprintf('%s file is not readable', $this->path));
    }

    $lines = file($this->path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

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

      list($name, $value) = explode('=', $line, 2);
      $name = trim($name);
      $value = trim($value);

      if (!array_key_exists($name, $_SERVER) && !array_key_exists($name, $_ENV)) {
        putenv(sprintf('%s=%s', $name, $value));
        $_ENV[$name] = $value;
        $_SERVER[$name] = $value;
      }
    }
  }
}