PHP Upload images script - php

Question

This is my code:
function secure_img_upload($file, $path, $options = array()){
// HANDLE OPTIONS
$validExtensions = isset($options['validExtensions']) ? $options['validExtensions'] : array('jpg', 'jpeg', 'png');
$surfix = isset($options['surfix']) ? $options['surfix'] : '';
// HANDLES FILES
$tempFile = $file['tmp_name'];
$fileName = $file['name'];
$extension = explode(".", $fileName);
$extension = strtolower(end($extension));
$imageName = sha1($fileName.uniqid());
$destination = rtrim($path, '/').'/'.$imageName.$surfix.'.'.$extension;
if(in_array($extension, $validExtensions)) {
$validExtension = true;
} else {
$validExtension = false;
}
// Run getImageSize function to check that we're really getting an image
if(getimagesize($tempFile) == false) {
$validImage = false;
} else {
$validImage = true;
}
if($validExtension == true && $validImage == true) {
if(move_uploaded_file($tempFile, $destination)) {
return $destination;
}else{
return array('s'=>'ko', 'm'=>T("Invalid path."));
}
}else{
return array('s'=>'ko', 'm'=>T("Invalid extension."));
}
}
My problem is that in this way, Images are uploaded in a random way.
But I need that images are uploaded in the order I select them. Any tips? Thank you