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Auteur: Richard - 08 januari 2006 - 10:30 - Gekeurd door: nemesiskoen - Hits: 7438 - Aantal punten: 4.00 (8 stemmen)

Simpele functie, je roept het aan met navigation ($_SERVER['REQUEST_URI'], 150, 5), dan krijg je dus een lijst met pagina's, maar niet allemaal, dus als je 100 pagina's hebt, wordt je layout niet verkloot.

uitleg hoe het werkt staat zo ongeveer wel in het script.

Code:

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<?php
/**
 * a simple navigation, without
 * too much characters, so your
 * layout won't be screwed
 * @param    string    page_url
 * @param    integer   total
 * @param    integer   limit
 * @return   string
 * @author   JeXuS <jexus@jexus.net>
**/
function navigation ($page_url, $total, $limit)
{
	// use sprintf, so you can easily edit this
	static $href = '<a href="%s">%s<a> ';
	// parameter used in url
	static $param = 'page';
	$param_preg = preg_quote ($param);

	// erase (&|?)page from the url (for extra security use a while)
	while (preg_match ('|[?&]' . $param_preg . '=[^&]*|i', $page_url))
	{
		// if it matches, replace it with nothing
		$page_url = preg_replace ('|[?&]' . $param_preg . '=[^&]*|i', '', $page_url);
	}
	// check if we have a correct URI (if it doesn't have a ?, we should replace 1 & with ?
	$page_url = (strpos ($page_url, '?') !== false) ? $page_url : preg_replace ('~&~', '?', $page_url, 1);
	// check if we have a '?', if so, the seperator is '&amp;'
	$seperator = (strpos ($page_url, '?') !== false) ? '&amp;' : '?';

	// the total pages
	$pages = ceil ($total / $limit);
	// check if the parameter was set
	$curr = (isset ($_GET[$param])) ? $_GET[$param] : 1;
	// check if the current page isn't too high or low
	$curr = ($curr < 1) ? 1 : (($curr > $pages) ? $pages : $curr);
	// check the middle, we always need 3 parts, so current might be too low
	$middle = ($curr < 7 || $curr > ($pages - 7)) ? round ($pages / 2) : false;
	// if the check wasn't false, create an array 'in the middle'
	$middle = ($middle !== false) ? array_keys (array_fill ($middle - 2, 4, '')) : array ();
	// create an array of integers we'll need
	$show = array_merge (
		array_keys (array_fill (0, 4, '')), // first set
		array_keys (array_fill ($curr - 2, 4, '')), // current set
		$middle, // middle set
		array_keys (array_fill ($pages - 4, 4, '')) // final set
	);
	// erase the doubles
	$show = array_unique ($show);
	// do a natural sort (1 2 3 etc.)
	// normally would be 1 10 11 etc.
	natsort ($show);

	// initialise for E_NOTICE error
	$return = '';
	// another init
	$prev = 1;
	// prev link
	$return .= ($curr > 1) ? sprintf ($href, $page_url . $seperator . $param . '=' . ($curr - 1), '&laquo;') : '';
	// loop through the pages
	foreach ($show as $page)
	{
		// update the page (pages like 1 to 10,
		//  not 0 to 9)
		$page += 1;
		// if it isn't out of bounds
		if ($page <= $pages && $page > 0)
		{
			// check if there's an open space
			if ($prev < $page - 1)
			{
				// if so, seperate nicely
				$return .= ' ... ';
			}
			// update prev counter
			$prev = $page;
			// append to the return string, check if it's the current page, otherwise a link
			$return .= ($page == $curr) ? "<b>{$page}</b> " : sprintf ($href, $page_url . $seperator . $param . '=' . $page, $page);
		}
	}
	// next link
	$return .= ($curr < $pages) ? sprintf ($href, $page_url . $seperator . $param . '=' . ($curr + 1), '&raquo;') : '';
	// return trimmed
	return rtrim ($return);
}

// voorbeeld:
echo navigation ($_SERVER['REQUEST_URI'], 50, 5);
?>

<?php
/**
 * a simple navigation, without
 * too much characters, so your
 * layout won't be screwed
 * @param    string    page_url
 * @param    integer   total
 * @param    integer   limit
 * @return   string
 * @author   JeXuS <jexus@jexus.net>
**/
function navigation ($page_url, $total, $limit)
{
	// use sprintf, so you can easily edit this
	static $href = '<a href="%s">%s<a> ';
	// parameter used in url
	static $param = 'page';
	$param_preg = preg_quote ($param);
 
	// erase (&|?)page from the url (for extra security use a while)
	while (preg_match ('|[?&]' . $param_preg . '=[^&]*|i', $page_url))
	{
		// if it matches, replace it with nothing
		$page_url = preg_replace ('|[?&]' . $param_preg . '=[^&]*|i', '', $page_url);
	}
	// check if we have a correct URI (if it doesn't have a ?, we should replace 1 & with ?
	$page_url = (strpos ($page_url, '?') !== false) ? $page_url : preg_replace ('~&~', '?', $page_url, 1);
	// check if we have a '?', if so, the seperator is '&amp;'
	$seperator = (strpos ($page_url, '?') !== false) ? '&amp;' : '?';
 
	// the total pages
	$pages = ceil ($total / $limit);
	// check if the parameter was set
	$curr = (isset ($_GET[$param])) ? $_GET[$param] : 1;
	// check if the current page isn't too high or low
	$curr = ($curr < 1) ? 1 : (($curr > $pages) ? $pages : $curr);
	// check the middle, we always need 3 parts, so current might be too low
	$middle = ($curr < 7 || $curr > ($pages - 7)) ? round ($pages / 2) : false;
	// if the check wasn't false, create an array 'in the middle'
	$middle = ($middle !== false) ? array_keys (array_fill ($middle - 2, 4, '')) : array ();
	// create an array of integers we'll need
	$show = array_merge (
		array_keys (array_fill (0, 4, '')), // first set
		array_keys (array_fill ($curr - 2, 4, '')), // current set
		$middle, // middle set
		array_keys (array_fill ($pages - 4, 4, '')) // final set
	);
	// erase the doubles
	$show = array_unique ($show);
	// do a natural sort (1 2 3 etc.)
	// normally would be 1 10 11 etc.
	natsort ($show);
 
	// initialise for E_NOTICE error
	$return = '';
	// another init
	$prev = 1;
	// prev link
	$return .= ($curr > 1) ? sprintf ($href, $page_url . $seperator . $param . '=' . ($curr - 1), '&laquo;') : '';
	// loop through the pages
	foreach ($show as $page)
	{
		// update the page (pages like 1 to 10,
		//  not 0 to 9)
		$page += 1;
		// if it isn't out of bounds
		if ($page <= $pages && $page > 0)
		{
			// check if there's an open space
			if ($prev < $page - 1)
			{
				// if so, seperate nicely
				$return .= ' ... ';
			}
			// update prev counter
			$prev = $page;
			// append to the return string, check if it's the current page, otherwise a link
			$return .= ($page == $curr) ? "<b>{$page}</b> " : sprintf ($href, $page_url . $seperator . $param . '=' . $page, $page);
		}
	}
	// next link
	$return .= ($curr < $pages) ? sprintf ($href, $page_url . $seperator . $param . '=' . ($curr + 1), '&raquo;') : '';
	// return trimmed
	return rtrim ($return);
}
 
// voorbeeld:
echo navigation ($_SERVER['REQUEST_URI'], 50, 5);
?>

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