Example usage a WordPress XML-RPC API

wordpress-xml-rpc-api-example.php

<?php

// Require: php5-xmlrpc
// sudo apt-get install php5-xmlrpc

// @note For debug only
header('Content-Type: text/plain;');

$wpUrl = '';
$wpUser = '';
$wpPass = '';

function do_api_request_via_curl($url, $xmlRequest)
{
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: text/xml']);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xmlRequest);

    $error = curl_error($ch);
    if ($error) {
        die('Error: ' . $error);
    }

    $response = curl_exec($ch);

    return $response;
}

function do_api_request_via_fgc($url, $xmlRequest)
{
    $options = [
        'http' => [
            'method' => 'POST',
            'header' => 'Content-Type: text/xml',
            'content' => $xmlRequest
        ]
    ];

    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);

    return $result;
}

$xmlRequest = xmlrpc_encode_request('mm.wpQuery', [1, $wpUser, $wpPass, [
    'category_name' => 'reviews',
    'numberposts' => 2
], ['ID', 'post_title']]);

//$xmlResponse = do_api_request_via_curl($wpUrl, $xmlRequest);
$xmlResponse = do_api_request_via_fgc($wpUrl, $xmlRequest);

$data = xmlrpc_decode($xmlResponse);

echo "<pre>"; print_r($data); echo "</pre>";