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[[installation]]
== Installation
Elasticsearch-php only has three requirements that you need to pay attention:
* PHP 7.1.0 or higher
* http://getcomposer.org[Composer]
* http://php.net/manual/en/book.curl.php[ext-curl]: the Libcurl extension for
PHP (see note below)
* Native JSON Extensions (`ext-json`) 1.3.7 or higher
The rest of the dependencies are automatically downloaded and installed by
Composer. Composer is a package and dependency manager for PHP and makes it easy
to install Elasticsearch-php.
[NOTE]
.Libcurl can be replaced
====
The default HTTP handlers that ship with Elasticsearch-php require the PHP
libcurl extension, but it is not technically required for the client to operate.
If you have a host that does not have libcurl installed, you can use an
alternate HTTP handler based on PHP streams. Performance _will_ suffer, as the
libcurl extension is much faster.
====
[discrete]
=== Version Matrix
You need to match your version of {es} to the appropriate version of this
library.
The master branch will always track {es} master, but it is not recommended to
use `dev-master` in your production code.
[width="40%",options="header",frame="topbot"]
|============================
|Elasticsearch Version | Elasticsearch-PHP Branch
| >= 7.0, < 8.0 | `7.0`
| >= 6.6, <= 6.7 | `6.7.x`
| >= 6.0, <= 6.5 | `6.5.c`
| >= 5.0, < 6.0 | `5.0`
| >= 1.0, < 5.0 | `1.0`, `2.0`
| <= 0.90.* | `0.4`
|============================
[discrete]
=== Composer Installation
* Include elasticsearch-php in your `composer.json` file. If you are starting a
new project, paste the following JSON snippet into a new file called
`composer.json`. If you have an existing project, include this requirement
under the rest of requirements already present:
+
[source,json]
--------------------------
{
"require": {
"elasticsearch/elasticsearch": "~7.0"
}
}
--------------------------
* Install the client with Composer. The first command downloads the
`composer.phar` PHP package, the second command invokes the installation.
Composer automatically downloads any dependencies, store them in a /vendor/
directory and build an autoloader:
+
[source,shell]
--------------------------
curl -s http://getcomposer.org/installer | php
php composer.phar install
--------------------------
+
More information about
http://getcomposer.org/[Composer can be found at their website].
* Include the generated autoloader in your main project. If your project is
already based on Composer, the autoloader is likely already included somewhere
and you don't need to add it again. Finally, instantiate a new client:
+
[source,php]
--------------------------
require 'vendor/autoload.php';
$client = Elasticsearch\ClientBuilder::create()->build();
--------------------------
+
Client instantiation is performed with a static helper function `create()`. This
creates a ClientBuilder object, which helps you to set custom configurations.
When you are done configuring, call the `build()` method to generate a `Client`
object. For further info, consult the <<configuration>> section.