代码清单：

<?php
/**
 * 获取当前页面的完整 url
 * @author ruxing.li
 * @return string
 */
function getPageUrl(){
    $url = (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443') ? 'https://' : 'http://';
    $url .= $_SERVER['HTTP_HOST'];
    $url .= isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : urlencode($_SERVER['PHP_SELF']) . '?' . urlencode($_SERVER['QUERY_STRING']);
    return $url;
}
echo getPageUrl();