Sentry is a developer-first application monitoring platform that helps you identify and fix software problems before they impact your users.

Using Sentry with PHP 5.3 requires an older version of the Sentry PHP SDK that supports PHP 5.3. Here’s a basic example using an older version of the SDK:

Step 1. Install an older version of the Sentry SDK:

Use Composer to install a version compatible with PHP 5.3. For example:

composer require sentry/sentry:1.7.0

Note: Check the available versions and choose one that supports PHP 5.3.

Require the autoloader in your application:

require_once '/path/to/Raven/library/Raven/Autoloader.php';
Raven_Autoloader::register();

Step 2. Configuration

The most important part is the creation of the raven client. Create it once and reference it from anywhere you want to interface with Sentry:

$client = new Raven_Client('YOUR_SENTRY_DSN');

Replace 'YOUR_SENTRY_DSN' with your current Sentry DSN.

Once you have the client, you can either use it manually or enable the automatic error and exception capturing, which is recommended:

$error_handler = new Raven_ErrorHandler($client);
$error_handler->registerExceptionHandler();
$error_handler->registerErrorHandler();
$error_handler->registerShutdownFunction();

Step 3. Capture errors:

try {
    // Your code that may throw an exception or trigger an error
} catch (Exception $e) {
    $client->captureException($e);
}

This captures exceptions and sends them to Sentry.

The full PHP file example:

<?php

require_once 'vendor/autoload.php';

Raven_Autoloader::register();

$client = new Raven_Client('YOUR_SENTRY_DSN');

$error_handler = new Raven_ErrorHandler($client);
$error_handler->registerExceptionHandler();
$error_handler->registerErrorHandler();
$error_handler->registerShutdownFunction();

try {
    throw new Exception('Hello world');
} catch (Exception $e) {
    $client->captureException($e);
}

Remember that PHP 5.3 is no longer supported, and using an unsupported PHP version poses security risks. Consider upgrading to a more recent PHP version if possible. Also, the provided code is a basic example, and error handling might need adjustments based on your specific use case.

Sources:

1. Legacy SDK for PHP