PHP code to show Location search in SOLR using Solarium. Details can be found at http://www.arunchinnachamy.com/how-to-use-solr-geo-spatial-search/

location_search_solarium.php

<?php
//Solarium Installed using composer.
require "vendor/autoload.php";

$config = array(
    'endpoint' => array(
        'localhost' => array(
            'host' => SOLR_IP,
            'port' => 8080,
            'path' => '/solr/',
            'core' => 'TEST_CORE'
        )
    )
);

$lat = $_GET['lat'];
$long = $_GET['long'];

$client = new Solarium\Client($config);

// get a select query instance and a query helper instance
$query = $client->createSelect();
$helper = $query->getHelper();

$query->setStart(0)->setRows(50);

// add a filterquery to find products in a range of 50km, using the helper to generate the 'geofilt' filter
$query->createFilterQuery('location')->setQuery($helper->geofilt('location', $lat, $long, 50));

// Get the distance as part of document field
$query->setFields(array('*','_dist_:geodist(location,'.$lat.','.$long .')'));

//Sorting the results based on the distance
$query->addSort('geodist(location,'.$lat.','.$long .')', $query::SORT_ASC);

$request = $client->createRequest($query);

//The variable can be used to debug. The variable contains the raw SOLR query
$debugInfo = (string)$request;

// this executes the query and returns the result
$resultset = $client->select($query);

// show documents using the resultset iterator
$results = array();
foreach($resultset as $document) {
    $item = array();
    foreach($document as $field => $value) {
        $item[$field] = $value;
    }
    $results[] = $item;
}
echo json_encode($results);