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Safe Link Arguments

/ Published in: PHP
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Make sure your URL $_GET variables don't get repeated / duplicated when you are creating links / URLs dynamically.

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  1. /**
  2. * Usage: 
  3. * <?php $url = 'http://www.yourwebsite.com/?page=1&showposts=10'; ?>
  4. * <a href="<?php echo safe_urls($url, 'page', '1'); ?>" title="Page 1">Page 1</a>
  5. * <a href="<?php echo safe_urls($url, 'page', '2'); ?>" title="Page 2">Page 2</a>
  6. * <a href="<?php echo safe_urls($url, 'page', '3'); ?>" title="Page 3">Page 3</a>
  7. *
  8. * <a href="<?php echo safe_urls($_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 'page', '3'); ?>" title="Page 3">Page 3</a>
  9. */
  10.  
  11. function safe_urls($url = '', $var = 'page', $value = '1'){
  12.  
  13. 	if(strpos($url, '?'))
  14. 	{
  15. 		if(strpos($url, $var))
  16. 		{
  17. 			$i = explode('?', $url);
  18. 			foreach($i as $arg)
  19. 			{
  20. 				$k = explode('&', $arg);
  21. 				foreach($k as $t)
  22. 				{
  23. 					$s = explode('=', $t);
  24. 					if ($s[0] == $var) $match = $s[0] . '=' . $s[1];
  25. 				}
  26. 			}
  27. 			$url = str_replace($match, $var . '=' . $value, $url);
  28. 		}
  29. 		else
  30. 		{
  31. 			$url .= '&' . $var . '=' . $value;		
  32. 		}
  33. 	}
  34. 	else
  35. 	{
  36. 		$url .= '?' . $var . '=' . $value;	
  37. 	}
  38. 	return $url;
  39. }

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