# Php

The '[fluent-logger-php](http://github.com/fluent/fluent-logger-php)' library is used to post records from PHP applications to Fluentd.

This article explains how to use the fluent-logger-php library.

## Prerequisites

* Basic knowledge of PHP
* Basic knowledge of Fluentd
* PHP 5.3 or higher

## Installing Fluentd

Please refer to the following documents to install fluentd.

* [Install Fluentd with rpm Package](/0.12/articles/install-by-rpm.md)
* [Install Fluentd with deb Package](/0.12/articles/install-by-deb.md)
* [Install Fluentd with Ruby Gem](/0.12/articles/install-by-gem.md)
* [Install Fluentd from source](/0.12/articles/install-from-source.md)

## Modifying the Config File

Next, please configure Fluentd to use the [forward Input plugin](broken://pages/-LT-Ygoo0Q0rcub1BgFs) as its data source.

```
# Unix Domain Socket Input
<source>
  @type unix
  path /var/run/td-agent/td-agent.sock
</source>
<match fluentd.test.**>
  @type stdout
</match>
```

Please restart your agent once these lines are in place.

```
# for rpm/deb only
$ sudo /etc/init.d/td-agent restart
```

## Using fluent-logger-php

To use fluent-logger-php, copy the library into your project directory.

```
$ git clone https://github.com/fluent/fluent-logger-php.git
$ cp -r src/Fluent <path/to/your_project>
```

Next, initialize and post the records as shown below.

```
<?php
require_once __DIR__.'/src/Fluent/Autoloader.php';
use Fluent\Logger\FluentLogger;
Fluent\Autoloader::register();
$logger = new FluentLogger("unix:///var/run/td-agent/td-agent.sock");
$logger->post("fluentd.test.follow", array("from"=>"userA", "to"=>"userB"));
```

Executing the script will send the logs to Fluentd.

```
$ php test.php
```

The logs should be output to `/var/log/td-agent/td-agent.log` or stdout of the Fluentd process via the [stdout Output plugin](broken://pages/-LR7PNyBmzLJzywBPLgR).

## Production Deployments

### Output Plugins

Various [output plugins](broken://pages/-LS28ivUSIcRHGAAQh8E) are available for writing records to other destinations:

* Examples
  * [Store Apache Logs into Amazon S3](/0.12/articles/apache-to-s3.md)
  * [Store Apache Logs into MongoDB](/0.12/articles/apache-to-mongodb.md)
  * [Data Collection into HDFS](/0.12/articles/http-to-hdfs.md)
* List of Plugin References
  * [Output to Another Fluentd](broken://pages/-LS2EqvLLGnjfrxO0sXh)
  * [Output to MongoDB](broken://pages/-LS2EqvW0RVW2fzsSUZq) or [MongoDB ReplicaSet](broken://pages/-LS2EqvXidlzvnp184Kn)
  * [Output to Hadoop](broken://pages/-LS2EqvUNSlo3ADF-Erh)
  * [Output to File](broken://pages/-LS2EqvITh0DM3zjDzYH)
  * [etc...](http://fluentd.org/plugin/)

### High-Availability Configurations of Fluentd

For high-traffic websites (more than 5 application nodes), we recommend using a high availability configuration of td-agent. This will improve data transfer reliability and query performance.

* [High-Availability Configurations of Fluentd](/0.12/deployment/high-availability.md)

### Monitoring

Monitoring Fluentd itself is also important. The article below describes general monitoring methods for td-agent.

* [Monitoring Fluentd](/0.12/deployment/monitoring.md)

If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open). [Fluentd](http://www.fluentd.org/) is a open source project under [Cloud Native Computing Foundation (CNCF)](https://cncf.io/). All components are available under the Apache 2 License.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.fluentd.org/0.12/articles/php.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.