Take env vars from a Symfony parameters.yml.dist file and put them in a .env.dist file

envimport.php

<?php
require __DIR__ . '/vendor/autoload.php';

$yaml = \Symfony\Component\Yaml\Yaml\Yaml::parseFile(__DIR__ . '/app/config/parameters.yml.dist');

$lines = [];
foreach ($yaml['parameters'] as $key => $value) {
    if (strpos($key, 'env(') === 0 && substr($key, -1) === ')' && $key !== 'env()') {
        $lines[] = substr($key, 4, -1) . '=' . "'$value'";
    }
}

file_put_contents('.env.dist', implode(PHP_EOL, $lines) . PHP_EOL);