📡 PHP Auto Custom OpenTelemetry Library

A PHP library for automatic telemetry using OpenTelemetry, enabling function and method monitoring via YAML configuration with minimal code changes.

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🎞️ Installation

Install via Composer from Packagist:

composer require zorzi23/custom-auto-open-telemetry

View on Packagist »

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⚙️ Requirements

• PHP >= 8.0

• opentelemetry PHP extension enabled

• Required PHP extensions: json, curl, etc.

• Core dependencies:

  • open-telemetry/opentelemetry
  • open-telemetry/sdk
  • open-telemetry/exporter-otlp
  • symfony/yaml
  • zorzi23/object_flow

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🛠️ PHP Configuration (php.ini)

[opentelemetry]
extension=opentelemetry.so
opentelemetry.allow_stack_extension=1

OTEL_PHP_AUTOLOAD_ENABLED=true
OTEL_SERVICE_NAME=your-service-name
OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
OTEL_EXPORTER_OTLP_ENDPOINT=http://192.168.197.33:4318
OTEL_PROPAGATORS=baggage,tracecontext
;OTEL_TRACES_EXPORTER=console ; Uncomment for local testing only

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📅 YAML Configuration Example

The library uses YAML files to declare which functions, methods, or classes should be instrumented. The structure supports nested children to define span hierarchies.

Example main config (telemetry_config.yml):

version: 1.0
name: 'Caop'
entities:
  - class: "CaOp\\Template\\TelemetryTemplates"
    method: "handleRequest"
    span_name: 'RequestInfo 😎'
    include:
      - file: "curl_telemetry_config.yml"
      - file: "postgres_telemetry_config.yml"

• The included YAML files (e.g., curl_telemetry_config.yml, postgres_telemetry_config.yml) define detailed instrumentation rules for specific libraries or domains.
• Each included file contains its own entities section specifying functions, span attributes, sensitive data masking, etc.

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🚀 Usage Example

<?php
declare(strict_types=1);
require_once('vendor/autoload.php');

function handleGlobalsInfo() {
    return $GLOBALS;
}

handleGlobalsInfo();

// Initialize cURL session
$ch = curl_init();

// Example URL (public API for testing)
$url = "https://example.com.br";

// Set cURL options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute the request
$response = curl_exec($ch);

// Check for errors
if (curl_errno($ch)) {
    echo 'cURL error: ' . curl_error($ch);
} else {
    // Decode JSON response if applicable
    $data = json_decode($response, true);
    print_r($data);
}

// Close the cURL session
curl_close($ch);

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🪠 Built-in Template Functions

The library provides optional utility functions under the CaOp\Templates\TelemetryTemplates namespace:

Function	Description
globalsInfo()	Captures the contents of $GLOBALS
handleRequest()	Captures $_SERVER, $_GET, $_POST, headers
sessionInfo()	Captures $_SESSION if a session is active

To use them, include TelemetryTemplates.php and reference their fully qualified names in your YAML config.

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🦖 Running Tests

vendor/bin/phpunit

Tests cover:

• Span hierarchy based on entity structure
• Attribute capture (e.g., curl_init)
• Error logging for invalid configurations

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📋 Notes

• Missing functions or methods are logged to the PHP error log.
• YAML-driven configuration allows easy extension of trace logic without modifying business code.
• YAML configs can be dynamically loaded at runtime.

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📄 License

MIT License © Gustavo H Zorzi A Pereira