PHPでファイル名を一括変更する方法

<?php
$dir = __DIR__."\image\\";
$list = scandir($dir);
foreach ($list as $item) {
  if(!in_array($item,[&#39;.&#39;,&#39;..&#39;])){
    $arr = explode(".", $item);
    $origin_name = reset($arr);
    $new_name = $origin_name.&#39;Abc.&#39;.end($arr);
    $origin_path = $dir.$item;
    $data = file_get_contents($origin_path);
    $new_path = $dir.$new_name;
    $res[] = file_put_contents($new_path, $data);
    unlink($origin_path);
  }
}

<?php
$dir = __DIR__."\image\\";
$list = scandir($dir);
foreach ($list as $item) {
  if(!in_array($item,[&#39;.&#39;,&#39;..&#39;])){
    $arr = explode(".", $item);
    $origin_name = reset($arr);
    $new_name = $origin_name.&#39;Abc.&#39;.end($arr);
    $origin_path = $dir.$item;
    $new_path = $dir.$new_name;
    copy($origin_path, $new_path);
    unlink($origin_path);
  }
}