Many times we get bored without any reason.. if this is one of those moments then don't worry, coding will make the moment a little bit lighter;
We'll create a webpage that'll display a random image on each visit(refresh) to the page. PHP will be the language in which we'll create the webpage.
First of all, the RandomImage class,
class RandomImage {
private $ImageDir;
private $FileList;
/* this is list of extension which will be allowed to display as an image */
private $FilterList = array("jpg", "jpeg", "gif", "png");
/* constructor */
public function __construct($initDir) {
$this->ImageDir = $initDir;
$this->FileList = array();
}
/* function to filter out files based on extension */
private function IsFileOkToShow($file){
$isOk = false;
/* check if file extension is not in the filter list */
$matched = false;
$fileExt = pathinfo($file, PATHINFO_EXTENSION);
foreach ((array)$this->FilterList as $ext) {
if(strcasecmp($fileExt, $ext) == 0) {
$matched = true;
break;
}
}
if($matched) {
$isOk = true;
}
return $isOk;
}
/* this function will scan through all the directories(in recursive manner)
* and build the list of files in all directories.
*/
private function buildImageList($dir) {
if($handle = opendir($dir)) {
while(false !== ($entry = readdir($handle))) {
if($entry == '.' || $entry == '..') {
continue;
}
$fullPath = $dir.'/'.$entry;
if(is_dir($fullPath)) {
$this->buildImageList($fullPath);
} else {
if($this->IsFileOkToShow($fullPath)) {
array_push($this->FileList, $fullPath);
}
}
}
closedir($handle);
}
}
/* public function to return a random file */
public function Get() {
$this->buildImageList($this->ImageDir);
srand((float)microtime()*1000000);
$fileCount = count($this->FileList);
if($fileCount > 0) {
$randomIndex = rand(0, $fileCount -1);
return $this->FileList[$randomIndex];
} else {
return "foo!";
}
}
}
This class is very simple and it has only one public function Get(). Calling the Get() function on an object of this class will scan through the directory and return a random file from it.
Upon receiving the filename, we'll pass this file to 'src' attribute of <img> tag, in order to display it.
<!-- html code to display the image -->
<html>
<head><title>Ignorance is bliss!</title></head>
<body>
<?php
$image = new RandomImage("PATH_TO_IMAGE_FOLDER");
?>
<img src="<?php echo $image->Get();?>">
<?php
?>
</body>
</html>
Thats all!
Download the attached source code and start clicking on refresh button!
