외부 이미지 서버 저장 코드 좀 봐주세요

<?php
//ver1.0 150410 @_untitle_d

function save_remote_image($url, $save_path)
{
    $ch = curl_init ($url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    $data=curl_exec($ch);
    curl_close ($ch);
 
 $chars_array = array_merge(range(0,9), range('a','z'), range('A','Z'));
 $filename = preg_replace("/\.(php|phtm|htm|cgi|pl|exe|jsp|asp|inc)/i", "$0-x", basename($url));
 shuffle($chars_array);
 $shuffle = implode("", $chars_array);
 $change_filename = abs(ip2long($_SERVER[REMOTE_ADDR])).'_'.substr($shuffle,0,8).'_'.str_replace('%', '', urlencode(str_replace(' ', '_', $filename)));
 $out_path = $save_path.$change_filename;
 
    if(file_exists($out_path)) @unlink($out_path);
    $fp = fopen($out_path,'x');
    fwrite($fp, $data);
    fclose($fp);
 
 return $change_filename;
}


if ($w == '' || $w == 'r'){

 $data_dir = G5_DATA_PATH.'/file/'.$bo_table.'/';
 $data_url = G5_DATA_URL.'/file/'.$bo_table.'/';
 
 $img_content = str_replace("&gt;", ">", str_replace("&lt;", "<", stripslashes($_POST[wr_content])));
 $patten = "/<img[^>]*src=[\"']?([^>\"']+)[\"']?[^>]*>/i";
 preg_match_all($patten, $img_content, $match);
 
 if ($match[1]) {
  foreach ($match[1] as $link) {
   $url = parse_url($link);
   if ($url[host] && $url[host] != $_SERVER[HTTP_HOST]) {
    $img_content = str_replace($link, ($data_url.save_remote_image($link, $data_dir)), $img_content);
   }
  }
  
  $sql = "update ".$write_table." set wr_content = '".sql_real_escape_string(trim($img_content))."' where wr_id = '".$wr_id."'";
  sql_query($sql);
 }
 
}
?>