How to Track Opt-Outs in PHP

Twilio’s PHP tutorial explains how to record SMS communication opt-outs to support privacy-law compliance and honor customer preferences. Using a Slim-based application, it receives Twilio Incoming Message Webhooks or Event Streams and checks the OptOutType parameter for keywords such as START, STOP, and HELP, then stores the customer’s Account SID, opt-out status, and timestamp in an SQLite database. The guide covers installing PHP dependencies, replacing PHP-DI with Laminas ServiceManager to integrate PHP-DB, configuring a table gateway and SQLite schema, exposing the local application through ngrok, and configuring Twilio webhooks or Event Streams with Advanced Opt-Out enabled. Although Twilio automatically blocks messages to unsubscribed recipients, maintaining an application-level record can help synchronize CRM data and prevent attempted messages that would produce a 20610 unsubscribed-recipient error.

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