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<?php
$dir = "/images/";

// Open directory and read contents
if (is_dir($dir)){
    if ($dh = opendir($dir)){
        // List files in the images directory
        while (($file = readdir($dh)) !== false){
            echo "filename:" . $file . "<br>";
        }
        rewinddir();
        // List files in the images directory again
        while (($file = readdir($dh)) !== false){
            echo "filename:" . $file . "<br>";
        }
        closedir($dh);
    }
}
?>

filename: cat.gif
filename: dog.gif
filename: horse.gif
filename: cat.gif
filename: dog.gif
filename: horse.gif