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-![Build Status](https://github.com/jonahgeorge/jaeger-client-php/workflows/Test/badge.svg) [![PHP version][packagist-img]][packagist]
-
-# Jaeger Bindings for PHP OpenTracing API
-
-This is a client-side library that can be used to instrument PHP apps for distributed trace collection,
-and to send those traces to Jaeger. See the [OpenTracing PHP API](https://github.com/opentracing/opentracing-php)
-for additional detail.
-
-## Contributing and Developing
-
-Please see [CONTRIBUTING.md](./CONTRIBUTING.md).
-
-## Installation
-
-Jaeger client can be installed via Composer:
-
-```bash
-composer require jonahgeorge/jaeger-client-php
-```
-
-## Getting Started
-
-```php
-<?php
-
-require_once 'vendor/autoload.php';
-
-use Jaeger\Config;
-use OpenTracing\GlobalTracer;
-
-$config = new Config(
-    [
-        'sampler' => [
-            'type' => Jaeger\SAMPLER_TYPE_CONST,
-            'param' => true,
-        ],
-        'logging' => true,
-    ],
-    'your-app-name'
-);
-$config->initializeTracer();
-
-$tracer = GlobalTracer::get();
-
-$scope = $tracer->startActiveSpan('TestSpan', []);
-$scope->close();
-
-$tracer->flush();
-```
-
-### Samplers
-
-List of supported samplers, for more info about samplers, please read [Jaeger Sampling](https://www.jaegertracing.io/docs/1.9/sampling/) guide.
-
-#### Const sampler
-This sampler either samples everything, or nothing.
-
-##### Configuration
-```
-'sampler' => [
-    'type' => Jaeger\SAMPLER_TYPE_CONST,
-    'param' => true, // boolean wheter to trace or not
-],
-```
-
-#### Probabilistic sampler
-This sampler samples request by given rate.
-
-##### Configuration
-```
-'sampler' => [
-    'type' => Jaeger\SAMPLER_TYPE_PROBABILISTIC,
-    'param' => 0.5, // float [0.0, 1.0]
-],
-```
-
-#### Rate limiting sampler
-Samples maximum specified number of traces (requests) per second.
-
-##### Requirements
-* `psr/cache` PSR-6 cache component to store and retrieve sampler state between requests.
-Cache component is passed to `Jaeger\Config` trough its constructor.
-* `hrtime()` function, that can retrieve time in nanoseconds. You need either `php 7.3` or [PECL/hrtime](http://pecl.php.net/package/hrtime) extension.
-
-##### Configuration
-```
-'sampler' => [
-    'type' => Jaeger\SAMPLER_TYPE_RATE_LIMITING,
-    'param' => 100 // integer maximum number of traces per second,
-    'cache' => [
-        'currentBalanceKey' => 'rate.currentBalance' // string
-        'lastTickKey' => 'rate.lastTick' // string
-    ]
-],
-```
-## Dispatch mode
-
-The library supports 3 ways of sending data to Jaeger Agent:  
-
-1. `Zipkin.thrift` over Compact protocol (socket - UDP) - default 
-2. `Jaeger.thrift` over Binary protocol (socket - UDP)
-2. `Jaeger.thrift` over Binary protocol (HTTP)
-
-If you want to enable "`Jaeger.thrift` over Binary protocol" one or other, than
-you need to set `dispatch_mode` config option or `JAEGER_DISPATCH_MODE` env
-variable.
-
-Allowed values for `dispatch_mode` are:
-- `jaeger_over_binary_udp`
-- `jaeger_over_binary_http`
-- `zipkin_over_compact_udp`
-
-There are 3 constants available, so it is better to use them:
-```php
-class Config
-{
-    const ZIPKIN_OVER_COMPACT_UDP   = "zipkin_over_compact_udp";
-    const JAEGER_OVER_BINARY_UDP    = "jaeger_over_binary_udp";
-    const JAEGER_OVER_BINARY_HTTP   = "jaeger_over_binary_http";
-    ...
-}
-```
-
-A possible config with custom `dispatch_mode` can look like this:
-```php
-// config.php
-
-use Jaeger\Config;
-
-return [
-    'sampler' => [
-        'type' => Jaeger\SAMPLER_TYPE_CONST,
-        'param' => true,
-    ],
-    'logging' => true,
-    "tags" => [
-        // process. prefix works only with JAEGER_OVER_HTTP, JAEGER_OVER_BINARY
-        // otherwise it will be shown as simple global tag
-        "process.process-tag-key-1" => "process-value-1", // all tags with `process.` prefix goes to process section
-        "process.process-tag-key-2" => "process-value-2", // all tags with `process.` prefix goes to process section
-        "global-tag-key-1" => "global-tag-value-1", // this tag will be appended to all spans
-        "global-tag-key-2" => "global-tag-value-2", // this tag will be appended to all spans
-    ],
-    "local_agent" => [
-        "reporting_host" => "localhost", 
-//        You can override port by setting local_agent.reporting_port value   
-        "reporting_port" => 6832
-    ],
-//     Different ways to send data to Jaeger. Config::ZIPKIN_OVER_COMPACT - default):
-    'dispatch_mode' => Config::JAEGER_OVER_BINARY_UDP,
-];
-```
-The full example you can see at `examples` directory.
-
-By default, for each `dispatch_mode` there is default `reporting_port` config value. Table with
-default values you can see below: 
-
-`dispatch_mode`          | default `reporting_port` 
------------------------- | ---------------- 
-ZIPKIN_OVER_COMPACT_UDP  | 5775
-JAEGER_OVER_BINARY_UDP   | 6832
-JAEGER_OVER_BINARY_HTTP  | 14268
-
-## IPv6
-
-In case you need IPv6 support you need to set `ip_version` Config variable.
-By default, IPv4 is used. There is an alias `Config::IP_VERSION` which you can use
-as an alternative to raw `ip_version`.
-
-Example:
-
-```php
-use Jaeger\Config;
-
-$config = new Config(
-    [
-        "ip_version" => Config::IPV6, // <-- or use Config::IP_VERSION constant
-        'logging' => true,
-        'dispatch_mode' => Config::JAEGER_OVER_BINARY_UDP,
-    ],
-    'serviceNameExample',
-);
-$config->initializeTracer();
-```
-or
-
-```php
-use Jaeger\Config;
-
-$config = new Config(
-    [
-        Config::IP_VERSION => Config::IPV6, // <--
-        'logging' => true,
-        'dispatch_mode' => Config::JAEGER_OVER_BINARY_UDP,
-    ],
-    'serviceNameExample',
-);
-$config->initializeTracer();
-```
-
-
-## Testing
-
-Tests are located in the `tests` directory. See [tests/README.md](./tests/README.md).
-
-## Roadmap
-
-- [Support Span baggage](https://github.com/jonahgeorge/jaeger-client-php/issues/5)
-- [Support Tracer metrics](https://github.com/jonahgeorge/jaeger-client-php/issues/12)
-- [Support Tracer error reporting](https://github.com/jonahgeorge/jaeger-client-php/issues/13)
-
-## License
-
-[MIT License](./LICENSE).
-
-[ci-img]: https://travis-ci.org/jonahgeorge/jaeger-client-php.svg?branch=travis
-[ci]: https://travis-ci.org/jonahgeorge/jaeger-client-php
-[packagist-img]: https://badge.fury.io/ph/jonahgeorge%2Fjaeger-client-php.svg
-[packagist]: https://badge.fury.io/ph/jonahgeorge%2Fjaeger-client-php