删除URL（PHP）中的旧参数

我正在使用PHP为表创建分页。 我使用以下代码创建分页链接

<a class='page-numbers' href='$href&pagenum=$i'>$i</a>

它工作得很好，但是，它会弄乱地址栏，每次添加一个新的pagenum参数。 所以它变成了pagenum=1&pagenum=3&pagenum=4

---

如何改进呢？

这个怎么样？可以肯定的是，我们进行了测试：）

$url = $_SERVER['REQUEST_URI'];
$urlparams = parse_url($url);
if(isset($urlparams['query']){
   parse_str($urlparams['query'],$vars);
   $vars['pagenum'] = $i;
   $urlparams['query'] = http_build_query($vars);
} else {
   $urlparams['query'] = 'pagenum='.$i;
}
$url = http_build_url($urlparams);
//http_build_url() is in PECL, you might need to manually rebuild the 
//url by looping through it's components:
/*
   $url=(isset($urlparams["scheme"])?$urlparams["scheme"]."://":"").
       (isset($urlparams["user"])?$urlparams["user"]:"").
       (isset($urlparams["pass"])? ":".$urlparams["pass"]:"").
       (isset($urlparams["user"])?"@":"").
       (isset($urlparams["host"])?$urlparams["host"]:"").
       (isset($urlparams["port"])?":".$urlparams["port"]:"").
       (isset($urlparams["path"])?$urlparams["path"]:"").
       (isset($urlparams["query"])?"?".$urlparams["query"]:"").
       (isset($urlparams["fragment"])?"#".$urlparams["fragment"]:""); 
*/

---

$href

也可能是一个安全问题。@alex-不是修辞性的：安全问题会是什么？类似于XSS的东西，通过

http://example.com/index.php/“>direct in body

？是的，但我大多数/所有浏览器都会在URL中对不好的字符进行编码。@alex-哦，我有一分钟忘记了请求URI包含GET内容。所以我想这比希望斜杠起作用更容易。呵呵。

$url = $_SERVER['REQUEST_URI'];
$urlparams = parse_url($url);
if(isset($urlparams['query']){
   parse_str($urlparams['query'],$vars);
   $vars['pagenum'] = $i;
   $urlparams['query'] = http_build_query($vars);
} else {
   $urlparams['query'] = 'pagenum='.$i;
}
$url = http_build_url($urlparams);
//http_build_url() is in PECL, you might need to manually rebuild the 
//url by looping through it's components:
/*
   $url=(isset($urlparams["scheme"])?$urlparams["scheme"]."://":"").
       (isset($urlparams["user"])?$urlparams["user"]:"").
       (isset($urlparams["pass"])? ":".$urlparams["pass"]:"").
       (isset($urlparams["user"])?"@":"").
       (isset($urlparams["host"])?$urlparams["host"]:"").
       (isset($urlparams["port"])?":".$urlparams["port"]:"").
       (isset($urlparams["path"])?$urlparams["path"]:"").
       (isset($urlparams["query"])?"?".$urlparams["query"]:"").
       (isset($urlparams["fragment"])?"#".$urlparams["fragment"]:""); 
*/

<?php
    $new_get = $_GET; // clone the GET array
    $new_get['pagenum'] = $i; // change the relevant parameter
    $new_get_string = http_build_query($new_get); // create the foo=bar&bar=baz string
?>
<a class="page-numbers" href="?<?php echo $new_get_string; ?>">
    <?php echo $i ?>
</a>

<?php
    $pageless_get = $_GET; // clone the GET array
    unset($pageless_get['pagenum']); // remove the pagenum parameter
    $pageless_get_string = http_build_query($pageless_get); // create the foo=bar&bar=baz string
    for($i = 0; $i < 10000; $i++):
        // append the pagenum param to the query string
        $page_param = "pagenum=$i";
        if($pageless_get_string) {
            $pageful_get_string = "$pageless_get_string&$page_param";
        } else {
            $pageful_get_string = $page_param;
        }
?>
    <a class="page-numbers" href="?<?php echo $pageful_get_string; ?>">
        <?php echo $i ?>
    </a>
<?php endfor ?>