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<?php
namespace TheAentMachine\AentDockerCompose\DockerCompose;
class EnvFile
{
/**
* @var string
*/
private $filePath;
public function __construct(string $filePath)
$this->filePath = $filePath;
}
* Adds or updates an environment variable.
public function set(string $key, string $value, string $comment = null): void
$content = $this->getContent();
if ($this->has($key)) {
// Note: if the key is already in the file, comments are not modified.
$content = \preg_replace("/^$key=.*/m", $key.'='.$value, $content);
} else {
$commentLines = \explode("\n", $comment ?? '');
$commentLines = \array_map(function (string $line) {
return '# '.$line;
}, $commentLines);
$comments = \implode("\n", $commentLines);
if ($comment) {
$content .= <<<ENVVAR
$comments
ENVVAR;
$key=$value
$return = \file_put_contents($this->filePath, $content);
if ($return === false) {
throw new \RuntimeException('Unable to write file '.$this->filePath);
private function has(string $envName): bool
if (!\file_exists($this->filePath)) {
return false;
return (bool) \preg_match("/^$envName=/m", $content);
private function getContent(): string
$content = \file_get_contents($this->filePath);
if ($content === false) {
throw new \RuntimeException('Unable to read file '.$this->filePath);
return $content;
theaentmachine /
aent-docker-compose
