こんな感じ
<?php $url = "https://qiita.com/api/v1/auth"; $data = array( 'url_name' => $url_name, 'password' => $password ); $content = http_build_query($data); $options = array('http' => array( 'method' => 'POST', 'content' => $content )); $contents = file_get_contents($url, false, stream_context_create($options)); print($contents); ?>