Script to delete old files from Slack

delete-from-slack.php

#!/usr/bin/env php
<?php
date_default_timezone_set('GMT');

if (count($argv)<2) {
	echo $argv[0] . ' <token> <until>' . PHP_EOL;
	echo 'Example: ' . $argv[0] . ' abcd-12345678-123456789-12345 \'-3 months\'' . PHP_EOL;
	exit;
}

$token = $argv[1];
$timestamp = isset($argv[2]) ? strtotime($argv[2]) : null;

function slack($function, $options = []) {
	global $token;
	$response = file_get_contents('https://slack.com/api/' . $function . '?' . http_build_query(array_merge(['token' => $token],$options)));
	return json_decode($response, true);
}

$files = slack('files.list', ['ts_to' => $timestamp]);
foreach ($files['files'] as $file) {
	$response = slack('files.delete', ['file' => $file['id']]);
	echo 'file ' . $file['id'] . ' deleted: ' . $file['permalink'] . PHP_EOL; 
}