멀티업로드를 할 때 do_upload를 사용하려고 했는데 파일이 서버에 안 올라가는거 같아서 error문을 출력해 봤는데
'업로드하려는 폴더가 쓰기 가능하지 않은 것으로 보입니다.' 같은 에러가 표시 됩니다
경로 폴더들 권한을 확인해 봤는데 707이고 777로 수정해 봤는데도 위와 같은 에러문구가 나오는데 뭐가 문제일까요??

로직은 https://www.cikorea.net/bbs/view/tip?idx=8201 이걸 참고했습니다






<table style="border:0; margin: 0 5px 0 0;" width="100%">
					<tr>
						<td align="left">
							<input type="file" name="file[]" value="파일선택" style="width: 120px; height: 22px; font-size: 8pt;" multiple="true"/>
						<td align="right">
							<input type="button" value="업로드" style="margin-left: 2px; height: 22px; font-size: 8pt;width: 60px;" onclick="javascript:doFileUpload();" />
						</td>
					</tr>
				</table>

<script>
function doFileUpload(){
    	var formData = new FormData($('#fileForm')[0]); 
    				
    	
    	$.ajax({ type: "POST",
    			 enctype: "multipart/form-data", // 필수 
    			 url: "/saveNewImage?m=<?=$menuid?>",
    			 data: formData, // 필수 
    			 processData: false, // 필수 
    			 contentType: false, // 필수 
    			 cache: false, 
    			 success: function (result) { 
    			 	//window.self.close();
    			 	//location.reload();
    			 }, error: function (e) { } });
	
	}
</script>

<?php

public function saveNewImage(){

    $field_name = 'file';
	$upload_dir = '/upload/result/'.$rsrv_sq;
	if(!is_dir($upload_dir)){
	    mkdir($upload_dir,0707,true);
	}
	    
	//$cnt_field = count($this->input->post($field_name));
	$multi_files = $_FILES;
	$cnt_field = count($_FILES[$field_name]['name']);
	    
	if($cnt_field > 0){
	        for($i=0;$i<$cnt_field;$i++){	            
	            $this->multi_upload($field_name, $upload_dir, $multi_files, $i);
        }	        
	}
}

public function multi_upload($field_name, $upload_dir, $multi_files=FALSE,$multi_index=FALSE){
	    
	    $config['upload_path'] = realpath($upload_dir);
	    $config['allowed_types'] = 'gif|jpg|jpeg|png|tif|tiff|mp4|pdf';
	    $config['encrypt_name']  = TRUE;
	    $config['remove_spaces']  = TRUE;
	    $config['overwrite']  = FALSE;
	    
	    
	    $this->load->library('upload', $config);
	    
	    if($multi_index !== FALSE)
	    {
	        $_FILES[$field_name]['name']= $multi_files[$field_name]['name'][$multi_index];
	        $_FILES[$field_name]['type']= $multi_files[$field_name]['type'][$multi_index];
	        $_FILES[$field_name]['tmp_name']= $multi_files[$field_name]['tmp_name'][$multi_index];
	        $_FILES[$field_name]['error']= $multi_files[$field_name]['error'][$multi_index];
	        $_FILES[$field_name]['size']= $multi_files[$field_name]['size'][$multi_index];
	    }
	    
	    
	    if($this->upload->do_upload($field_name)){
	        
	        echo "success";
	        
	    }else{
	        
	        echo $this->upload->display_errors();
	    }
	    
	}

    ?>