Fire a Slack Notification via CURL

slack_notification.php

<?php

// (string) $message - message to be passed to Slack
// (string) $room - room in which to write the message, too
// (string) $icon - You can set up custom emoji icons to use with each message
public static function slack($message, $room = "engineering", $icon = ":longbox:") {
        $room = ($room) ? $room : "engineering";
        $data = "payload=" . json_encode(array(
                "channel"       =>  "#{$room}",
                "text"          =>  $message,
                "icon_emoji"    =>  $icon
            ));
	
	// You can get your webhook endpoint from your Slack settings
        $ch = curl_init("WEBHOOK ENDPOINT GOES HERE");
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $result = curl_exec($ch);
        curl_close($ch);
	
	// Laravel-specific log writing method
        // Log::info("Sent to Slack: " . $message, array('context' => 'Notifications'));

        return $result;
    }

Thanks for this!

@pugwonk Hello - I'm having similar URL-encoding issues. I tried your suggestion of curl_setopt($ch, CURLOPT_POSTFIELDS, array('payload' => $data)); which let me pass just about any character through without causing the Slack invalid_payload error - brilliant! :)

But the actual message came through to Slack in url-encoded form instead of readable text :( I think Slack have changed how they handle this since your post.

I'm doing $message = urlencode($message); - if I don't then I can't get proper formatting in the Slack message (it displays \n instead of actually putting in a line-break for example).

Has anyone else spotted anything like this?

Here's my code (roughly!):

            $message = urlencode($message); // Contains things like 'This is the message to the channel:\n\nHere is the second line with some *bold text* hopefully!'

            $channel = '#the-channel-to-post-to';
            $data = 'payload=' . json_encode(array(
                    'channel'  => $channel,
                    'text'     => $message,
            ));

            $url = 'MY_WEBHOOK_URL';

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($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);
            if ($result === false) {
                echo 'Curl error: ' . curl_error($ch);
            }

            curl_close($ch);

Thanks :)

If it helps anyone, I got around most of the encoding problems by passing the parts of my $message through this function:

function htmlReplace($string) {
    // https://api.slack.com/docs/message-formatting#how_to_escape_characters
    // Also use backslashes to escape double quotes/backslashes themselves,
    // that would otherwise break the JSON.
    // (deal with the slashes before the quotes otherwise the escaped quotes would be re-escaped!)
    return str_replace(array('&', '<', '>', '\\', '"'), array('&amp;', '&lt;', '&gt;', '\\\\', '\"'), $string);
}

Thank you

Thank you!

Top job exactly what I was looking for.

How are you able to set the channel? When I'm giving permission for my app to use the Incoming Webhook, I get a unique URL for every single Channel. I can send the channel all day long, but it's the URL that defines which channel it goes to. Is there a generic URL that I can't find? Or is there a permission I need to create that I am overlooking?

hello
i want to use slack rest api in curl to create a channel not with webhook but that is not working plz help me

Those this still work i am getting an error missing_text_or_fallback_or_attachments

thanks, it's help me so mush :)

in symfony nexylan / slack-bundle, we use "withIcon" to change the icon but here how to do it ?

Brilliant, thanks. emoji icons aren't working for me but, besides that, it's a very useful function!