php发送post请求的方法

<?php
/**
 * 发送post请求
 * @param string $url 请求地址
 * @param array $post_data post键值对数据
 * @return string
 */
function send_post($url, $post_data) {
  	$postdata = http_build_query($post_data);
 	$options = array(
    ‘http‘ => array(
		‘method‘ => ‘POST‘,
		‘header‘ => ‘Content-type:application/x-www-form-urlencoded‘,
		‘content‘ => $postdata,
		‘timeout‘ => 15 * 60 // 超时时间（单位:s）
    )
  );
  	$context = stream_context_create($options);
 	$result = file_get_contents($url, false, $context);
  	return $result;
}
//测试
/*$post_data = array(
  	‘username‘ => ‘makalo‘,
  	‘password‘ => ‘kelochen‘
);
echo send_post(‘http://localhost:8080/CAS/test.php‘, $post_data);*/
?>