Sven\FlexEnv\Env::replaceInFile PHP Méthode

    public function replaceInFile($old, $new, $append = 0)
    {
        $contents = $this->previous;
        $replaceWith = preg_replace("~{$old}\n?~", "{$new}\n", $contents);
        file_put_contents($this->getPath(), $replaceWith, $append);
        return $this;
    }