sendmessagetoslack.php

<?php
/**
 * Send a Message to a Slack Channel.
 *
 * Get the API Token visit: https://api.slack.com/custom-integrations/legacy-tokens
 * The token will look like this `xoxo-250000090-0000000000-0000000000-dbssg`.
 * 
 * @param string $message The message to post in channel.
 * @param string $channel The name of the channel prefixed with #
 * @return boolean
 */
function slack($message, $channel)
{
    $ch = curl_init("https://slack.com/api/chat.postMessage");
    $data = http_build_query([
        "token" => "YOUR_API_TOKEN",
    	  "channel" => $channel,
    	  "text" => $message,
    	  "username" => "SlackBot",
    ]);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $result = curl_exec($ch);
    curl_close($ch);
    
    return $result;
}
slack('Hello World', '#your-slack-channel');