PHP rewinddir() 函数

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

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