Quick and dirty Slack request parsing in PHP

parse-slack-request.php

<?php

function parse_slack_request(string $body): array
{
    if (empty($body)) {
        return [];
    }

    if ($body[0] === '{') {
        $data = json_decode($body, true);
    } else {
        parse_str($body, $data);
    }

    if (isset($data['payload'])) {
        $data = json_decode(urldecode($data['payload']), true);
    }

    return $data;
}

// Example
$body = file_get_contents('php://input');
$data = parse_slack_request($body);