Wonderful Webhook Alerts

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What is a webhook URL?

A webhook URL is a special web address provided by services like Slack, Discord, or Zapier. When your WordPress site sends a message to this URL, the service receives it and can post it, for example, in a specific chat channel. You can get this URL from the settings of your chosen service.

Does this plugin affect my site’s performance?

It reads its settings once per request and holds back half a megabyte of memory, so it can still report if the request runs out. Beyond that it does nothing until a fatal error happens.

Which error types are reported?

The plugin reports E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR, E_USER_ERROR, and E_RECOVERABLE_ERROR — the same set WordPress itself treats as fatal.

Does it also report „Allowed memory size exhausted“?

Yes, labelled separately. On an out-of-memory crash the file and line PHP reports are wherever the last allocation landed, not the cause — so the notification also carries peak memory, the configured limit and the crashed request.

The same error keeps happening. Will I get flooded?

No. An identical error — same message, file and line — is reported at most once every five minutes, so a fault that hits many requests at once still produces one notification.

Does the plugin add a file to wp-content?

Yes: wp-content/fatal-error-handler.php, WordPress‘ official drop-in. It has to run first — WordPress registers its own shutdown handler before plugins load, and by then the error can already have been replaced by a later one.

If another plugin already owns that file, it stays untouched and the settings page says so. Alerts keep working either way. The file is removed when you deactivate or delete the plugin.

Can I intercept the notification?

Yes. The filter wonderful_webhook_alerts_pre_crash_dispatch receives ( null, $url, $body ) and replaces the built-in transport when it returns anything but null.