PHP - 发送脚本的url-address

Question

I'm creating pagging for some data. For example, I have a page:

http://example.com/news.php?type=bla&smth=bla

There are I have a list of news with links to another pages. Link to the first page is:

http://example.com/news.php?type=bla&smth=bla&page=1

Here is script, which creates pages links:

print '<a href="?'.$_SERVER['QUERY_STRING'].'&page=1"><<</a>'; 

But after clicking to another pages the link URL is very large and it looks like:

http://example.com/news.php?type=bla&smth=bla&page=1&page=2&page=1&page=3

How can I change that?

Answer 1

You are just append the new paremeter to the old ones but you don’t replace it if already existing. So you rather need to merge the old query string with the new one:

// either by merging both arrays
$query = array_merge($_GET, array('page'=>1));
// or by the union of both
$query = array('page'=>1) + $_GET;
// or by altering the array
$query = $_GET;
$query['page'] = 1;

And PHP does already have a http_build_str that can build you a query string from an associative array:

print '<a href="?' . htmlspecialchars(http_build_str($query)) . '">&lt;&lt;</a>';

---

Edit    Here’s an alternative definition of http_build_str:

if (!function_exists('http_build_str')) {
    function http_build_str($query, $prefix='', $arg_separator='') {
        if (!is_array($query)) {
            return null;
        }
        if ($arg_separator == '') {
            $arg_separator = ini_get('arg_separator.output');
        }
        $args = array();
        foreach ($query as $key => $val) {
            $name = $prefix.$key;
            if (!is_numeric($name)) {
                $args[] = rawurlencode($name).'='.urlencode($val);
            }
        }
        return implode($arg_separator, $args);
    }
}