<?php 
 
error_reporting ('E_ALL ^ E_NOTICE'); 
 
class UrlGenerator    { 
    function __construct ($state = array())    { 
        $this->base = $_SERVER['PHP_SELF']; 
        $this->state = $state; 
    } 
    function render ($base = null, $array = array())    { 
        return ($base ? $base : $this->base) . '?' . http_build_query (array_merge ($this->state, $array)); 
    } 
} 
 
// Pretend this is a state object, and the code below is set up by A_Pager_Request 
$state = array(); 
$state['page'] = $_GET['page'] ? $_GET['page'] : 1; 
$state['sort_key'] = $_GET['sort_key'] ? $_GET['sort_key'] : 'text'; 
$state['sort_order'] = $_GET['sort_order'] ? $_GET['sort_order'] : 'asc'; 
$state['items_per_page'] = $_GET['items_per_page'] ? $_GET['items_per_page'] : 10; 
 
// Optional: if you want link to persist. Maybe this is set up by another component? 
// $state['link'] = $_GET['link'] ? $_GET['link'] : 1; 
 
$url = new UrlGenerator ($state); 
 
?> 
 
<p> 
<a href="<?php echo $url->render(array ('link' => 1)); ?>"><?php if ($_GET['link'] == 1): ?><strong>Link1</strong><?php else: ?>Link1<?php endif ?></a> 
<a href="<?php echo $url->render(array ('link' => 2)); ?>"><?php if ($_GET['link'] == 2): ?><strong>Link2</strong><?php else: ?>Link2<?php endif ?></a> 
<a href="<?php echo $url->render(array ('link' => 3)); ?>"><?php if ($_GET['link'] == 3): ?><strong>Link3</strong><?php else: ?>Link3<?php endif ?></a> 
</p> 
<p> 
<a href="<?php echo $url->render('child_state.php'); ?>">View Child</a> 
</p> 
 
<form method="get" action=""> 
<input type="hidden" name="page" value="<?php echo $_GET['page'] ? $_GET['page'] : 1; ?>" /> 
<?php if ($state['link']): ?><input type="hidden" name="link" value="<?php echo $_GET['link'] ? $_GET['link'] : 1; ?>" /><?php endif; ?> 
Order by: <select name="sort_key"> 
<option value="id" <?php if ($_GET['sort_key'] == 'id'): ?>selected="selected"<?php endif; ?>>ID</option> 
<option value="text" <?php if ($_GET['sort_key'] == 'text'): ?>selected="selected"<?php endif; ?>>text</option> 
<option value="sort" <?php if ($_GET['sort_key'] == 'sort'): ?>selected="selected"<?php endif; ?>>Sort</option> 
</select> 
<select name="sort_order"> 
<option value="asc" <?php if ($_GET['sort_order'] == 'asc'): ?>selected="selected"<?php endif; ?>>Ascending</option> 
<option value="desc" <?php if ($_GET['sort_order'] == 'desc'): ?>selected="selected"<?php endif; ?>>Descending</option> 
</select> 
Items per page: <select name="items_per_page"> 
<option value="5" <?php if ($_GET['items_per_page'] == '5'): ?>selected="selected"<?php endif; ?>>5</option> 
<option value="10" <?php if ($_GET['items_per_page'] == '10'): ?>selected="selected"<?php endif; ?>>10</option> 
</select> 
<input type="submit" name="submit" value="Show" /> 
</form>
 
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