PHP Solr giving a Catchable fatal error - php

Question

The following is my code which adds documents and fires a query using Solr.
It's showing an error:
SolrInputDocument number 1 is not a valid SolrInputDocument instance
Catchable fatal error: Argument 1 passed to SolrClient::query() must be an instance of SolrParams, string given in /var/www/ps/test.php on line 85
<?php
require_once( 'bootstrap.php' );
$options = array( 'hostname' => SOLR_SERVER_HOSTNAME );
$client = new SolrClient($options);
// Create two documents to represent two auto parts.
$parts = array(
'spark_plug' => array(
'partno' => 1,
'name' => 'Spark plug',
'model' => array( 'Boxster', '924' ),
'year' => array( 1999, 2000 ),
'price' => 25.00,
'inStock' => true,
),
'windshield' => array(
'partno' => 2,
'name' => 'Windshield',
'model' => '911',
'year' => array( 1999, 2000 ),
'price' => 15.00,
'inStock' => false,
)
);
$documents = array();
foreach ( $parts as $item => $fields ) {
$part = new SolrDocument();
foreach ( $fields as $key => $value ) {
if ( is_array( $value ) ) {
foreach ( $value as $datum ) {
$part->addField( $key, $datum );
}
}
else {
$part->$key = $value;
}
}
$documents[] = $part;
}
// Load the documents into the index
try {
$client->addDocuments( $documents );
$client->commit();
$client->optimize();
}
catch ( Exception $e ) {
echo $e->getMessage();
}
// Run some queries.
$offset = 0;
$limit = 10;
$queries = array(
'partno: 1 OR partno: 2',
'model: Boxster',
'name: plug'
);
foreach ( $queries as $query ) {
$queryResponse = $client->query($query);
if ( $queryResponse->getHttpStatus() == 200 ) {
// print_r( $response->getRawResponse() );
if ( $queryResponse->response->numFound > 0 ) {
echo "$query <br />";
foreach ( $queryResponse->response->docs as $doc ) {
echo "$doc->partno $doc->name <br />";
}
echo '<br />';
}
}
else {
echo $queryResponse->getHttpStatusMessage();
}
}
?>