Zufallsbild

Wenn man nicht immer das selbe Bild oder Banner haben will, kann man mit dieser Funktion ein zufälliges Bild aus einem Verzeichnis auslesen und anzeigen.

  1. /**
  2.  * Smarty plugin
  3.  * @package Smarty
  4.  * @subpackage plugins
  5.  *
  6.  *
  7.  * Smarty random_pic function plugin
  8.  *
  9.  * Type:     function
  10.  * Name:     random_pic
  11.  * Purpose:  loads a random pic from dir
  12.  *
  13.  * use:		{random_pic dir='path/to/dir' alt='some description' width='300' height='200'}
  14.  * 			the width and height can be omitted, it will be added automatically
  15.  * 			but you can use this to overide those values
  16.  *
  17.  * @author Johannes 'Banana' Keßler <mail at bananas-playground dot net>
  18.  * @param array
  19.  * @param Smarty
  20.  */
  21. function smarty_function_random_pic($params, &$smarty)
  22. {
  23.     if(!isset($params['dir'])) return false;
  24.  
  25.     if(!isset($params['type']))
  26.     {
  27.     	$type = false;
  28.     }
  29.  
  30. 	// check if we have an / at the end
  31. 	// if not add some
  32. 	$params['dir'] = str_replace("'","",$params['dir']);
  33. 	$dir_tmp = substr($params['dir'],-1,1);
  34. 	if($dir_tmp != "/")
  35. 	{
  36. 		$params['dir'] .= "/";
  37. 	}
  38.  
  39. 	// read files from dir
  40. 	// and supress error messages
  41. 	$files = array();
  42. 	$dh = @opendir($params['dir']);
  43. 	while(false !== ($file = @readdir($dh)))
  44. 	{
  45. 		if($file[0] ==".") continue;
  46.  
  47. 		if(is_file($params['dir'].$file))
  48. 		{
  49. 			if($params['type'])
  50. 			{
  51. 				if(strstr($file,$params['type']))
  52. 				{
  53. 					$files[] = $file;
  54. 				}
  55. 			}
  56. 			else
  57. 			{
  58. 				$files[] = $file;
  59. 			}
  60. 		}
  61. 	}
  62. 	@closedir($dh);
  63.  
  64. 	// if no files are found raise an error
  65. 	if(!isset($files[0]))
  66. 	{
  67. 		 $smarty->trigger_error("random_pic: either wrong 'dir', 'type' value or no files available");
  68. 		 return false;
  69. 	}
  70.  
  71. 	// get the random pic
  72. 	$picCount = count($files)-1;
  73. 	$rand = rand(0,$picCount);
  74. 	$pic = $files[$rand];
  75.  
  76. 	// check if we have set the width or height
  77. 	if(!isset($params['width']) || !isset($params['width']))
  78. 	{
  79. 		$picInfo = getimagesize($params['dir'].$pic);
  80. 		$params['width'] = $picInfo[0];
  81. 		$params['height'] = $picInfo[1];
  82. 	}
  83.  
  84.  
  85.     // the return code
  86.     $out = '<img src="'.$params['dir'].$pic.'" alt="'.$params['alt'].'" width="'.$params['width'].'"
  87.     		height="'.$params['height'].'" />';
  88.  
  89.     return $out;
  90. }
the end