Find out what environments can be cleared from platform.sh

clean-environments.php

#!/usr/bin/env php
<?php

$environments = explode("\n", `platform environments --columns=title,status --format=tsv --no-header | grep -v "\tInactive" | awk "{print \\$1}"`);
$remote_branches = explode("\n", `git ls-remote --heads | awk "{ print \\$2 }" | sed 's/refs\\/heads\\///'`);

$environments = \array_diff($environments, [
    "Master",
    "develop",
    "qa",
    "uat",
], $remote_branches);

echo "platform environment:delete -y " . implode(" ", $environments);
echo "; platform environment:delete --inactive -y\n";