RezImgCrop - function cannot be a directory

[2017-01-23 14:14:17] (ERROR @ /.../core/cache/includes/elements/modsnippet/123.include.cache.php : 29) PHP warning: copy(): The first argument to copy() function cannot be a directory

<?php
/**
 * RezImgCrop
 * Copyright 2011 by Artdevue.com  <[email protected]>
 * Arguings at a forum http://community.modx-cms.ru/
 * @package rezimgcrop
 */
/**
 * RezImgCrop
 * A dynamic form processing Snippet for MODx Revolution 2.0.
 *
 * @package rezimgcrop
 */

$output = trim($input);
$serve = $modx->getOption('base_path');
$opt = explode(',',$options);
if (count($opt) >= 1) {
  $trans = array("-"=>"", "x"=>"", ","=>"");
  $m_name = strip_tags(strtr($options, $trans));
  $images_name = basename($output);
  $images_dir = dirname($output);
  $imagprev = $images_dir{0} == '/' ? '' : '/';
  $images_dir = $imagprev.$images_dir;
  $dir_new = $images_dir.'/rezcrop/'; 
  if (!file_exists($serve.$dir_new.$m_name.'_'.$images_name)) {    
    if(!file_exists($serve.$dir_new)) mkdir($serve.$dir_new, 0777);
    $newimg = $dir_new.$m_name.'_'.$images_name;
    if (!copy($serve.$imagprev.$output, $serve.$newimg)) {
      return $output;
}
    $col = count($opt)-1;
    for ($x=0; $x<=$col;){
      $frc = explode('-',$opt[$x]);
      $par = explode('x',$frc[1]);
      if($frc[0] == 'r') {
        if(!$par[1]){
            list($w, $h) = getimagesize($serve.$newimg);
            if ($w < $h) {
                $parnol = $par[0];
                $par[0] = '';
                $par[1] = $parnol;
            }
        }
	$modx->runSnippet('RezImg',array(
   'file_input' => $serve.$newimg,
	  'file_output' => $serve.$newimg,
	  'w_o' => $par[0],
	  'h_o' => $par[1]
));
      }
      if($frc[0] == 'c') {
	list($w, $h) = getimagesize($serve.$newimg);
    		$ym = $xm = 0;
    		$ym = ($h - $par[1])/2;
            $xm = ($w - $par[0])/2;
	$modx->runSnippet('CropImg',array(
   'file_input' => $serve.$newimg,
	  'file_output' => $serve.$newimg,
	  'crop' => array($xm,$ym,$par[0]+$xm,$par[1]+$ym)
));
      }
      if($frc[0] == 'g') {	
	$modx->runSnippet('GrayscaleImg',array(
   'file_input' => $serve.$newimg,
	  'file_output' => $serve.$newimg
));
}
      if ($frc[0] == 'min') {
        list($w, $h) = getimagesize($serve.$newimg);
        if($w < $h){
            $maxwo = $frc[1];
            $maxho = '';
        }else{
            $maxwo = '';
            $maxho = $frc[1];
        }
        $modx->runSnippet('RezImg',array(
   'file_input' => $serve.$newimg,
	  'file_output' => $serve.$newimg,
	  'w_o' => $maxwo,
	  'h_o' => $maxho
));
      }
      $x++;
    }
  }
  $output = $dir_new.$m_name.'_'.$images_name;
  return $output;
}
return $output;
return;