How to Rename Image File on Upload Using this Script - php

Question

Please could someone show me where i need to change the code so that the image uploaded is renamed to "freddy" for e.g.
But still carries the correct existing extension i.e jpg, png, gif.
Thanks In Advance
<?php
// define a constant for the maximum upload size
define ('MAX_FILE_SIZE', 1024 * 50);
if (array_key_exists('upload', $_POST)) {
// define constant for upload folder
define('UPLOAD_DIR', '/home/richard/public_html/testing/editable-images/');
// replace any spaces in original filename with underscores
$file = str_replace(' ', '_', $_FILES['image']['name']);
// create an array of permitted MIME types
$permitted = array('image/gif', 'image/jpeg', 'image/pjpeg',
'image/png');
// upload if file is OK
if (in_array($_FILES['image']['type'], $permitted)
&& $_FILES['image']['size'] > 0
&& $_FILES['image']['size'] <= MAX_FILE_SIZE) {
switch($_FILES['image']['error']) {
case 0:
// check if a file of the same name has been uploaded
// Uncomment to stop overwritten files >>>> if (!file_exists(UPLOAD_DIR . $file)) {
// move the file to the upload folder and rename it
$success =
move_uploaded_file($_FILES['image']['tmp_name'], UPLOAD_DIR .
$file);
// Uncomment to stop overwritten files >>>> } else {
// Uncomment to stop overwritten files >>>> $result = 'A file of the same name already exists.';
// Uncomment to stop overwritten files >>>>> }
if ($success) {
$result = "$file uploaded successfully.";
} else {
$result = "Error uploading $file. Please try again.";
}
break;
case 3:
case 6:
case 7:
case 8:
$result = "Error uploading $file. Please try again.";
break;
case 4:
$result = "You didn't select a file to be uploaded.";
}
} else {
$result = "$file is either too big or not an image.";
}
}
?>

Answer 1

// get file extension
$ext = end(explode($_FILES['image']['name']));
// name your file and preserve file extension
$file = "freddy.".$ext;
// create an array of permitted MIME types
....

Answer 2

Check description of method move_uploaded_file here