Apache Solr 4.0+ Update document

update.php

<?php
// https://wiki.apache.org/solr/UpdateJSON
$data = array(
	array(
		'id' => $id,
		'field' => array(
			'set' => 'value', // set is keyword
		)
	)
);

$json = json_encode($data);


$ch = curl_init('http://localhost:8985/solr/collection1/update?commit=true');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
	'Content-Type: application/json',
	'Content-Length: ' . strlen($json))
);

$result = curl_exec($ch);