slack php function

slack.php

<?php
define ( 'SLACK_WEBHOOK', 'https://hooks.slack.com/services/' );
function slack ( $message, $username, $channel )
{
    switch ( $channel )
    {
        case 'delivery-form':
            $token = '...';
        break;
    }
    $msg = array ( 'text' => $message, "username" => "..." );
    $c = curl_init ( SLACK_WEBHOOK . $token );
    curl_setopt ( $c, CURLOPT_RETURNTRANSFER, true );
    curl_setopt ( $c, CURLOPT_SSL_VERIFYPEER, false );
    curl_setopt ( $c, CURLOPT_POST, true );
    curl_setopt ( $c, CURLOPT_POSTFIELDS, array ( 'payload' => json_encode ( $msg ) ) );
    curl_exec ( $c );
    curl_close ( $c );
}