randomly rename files in php - php

Question

I have a folder of 1000 images and I need to randomly rename them from 1.jpg to 1000.jpg , it must be completely random each time I run the script.
I just need that 1.jpg is different each time I run the script.
all I have to work with so far is the following code.
Please help. Thanks
<?php
if (file_exists('Image00001.jpg'))
{
$renamed= rename('Image00001.jpg', '1.jpg');
if ($renamed)
{
echo "The file has been renamed successfully";
}
else
{
echo "The file has not been successfully renamed";
}
}
else
{
echo "The original file that you want to rename does not exist";
}
?>

Answer 1

Check this out, if this helps. I tried it out and it works. Create a php file and copy the code, and in the same directory create a folder name files and fill it with images with extension .jpg and then run the php file. This is the refined code. Let me know if this works for you.
<?php
$dir = 'files/'; //directory
$files1 = scandir($dir);
shuffle($files1); //shuffle file names
$i = 1; //initialize counter
//store existing numbered files in array
$exist_array = array();
while (in_array($i . ".jpg", $files1)) {
array_push($exist_array, $i . ".jpg");
$i++;
}
foreach ($files1 as $ff) {
if ($ff != '.' && $ff != '..') // check for current or parent directory, else it will replace the directory name
{
// check whether the file is already numbered
if (in_array($ff, $exist_array)) {
continue;
}
//next 3 lines is proof of random rename
echo $ff . " ---> ";
rename($dir . $ff, $dir . $i . ".jpg");
echo $i . ".jpg<br/>";
$i++;
}
}
?>