move_uploaded_file()无法将文件从tmp移动到dir

我一直在寻找解决方案,但我找不到答案.

我创建了一个图片上传表单.它使用ajaxform插件运行.但它仍然没有上传到目录.error_log说

move_uploaded_file()无法将文件从[tmp]移动到[dir].

然后在前端显示上传完成.但是当调用文件时,它不存在.

HTML代码:

  
    

        
        
    

    

        

            

            
0%
        
        

    
    

JS:

var options = { 
    beforeSend: function() 
    {
        $(".imguploadProgress").show();
        $(".imguploadProgressBar").width('0%');
        $(".imguploadMsg").html("");
        $(".imguploadProgressPercent").html("0%");
    },
    uploadProgress: function(event, position, total, percentComplete) 
    {
        $(".imguploadProgressBar").width(percentComplete+'%');
        $(".imguploadProgressPercent").html(percentComplete+'%');

    },
    success: function() 
    {
        $(".imguploadProgressBar").width('100%');
        $(".imguploadProgressPercent").html('100%');

    },
    complete: function(response) 
    {
        alert('Complecion');
    },
    error: function()
    {
        $(".imguploadMsg").html(" ERROR: unable to upload files");
    }

    }; 

     $("#profpicform").ajaxForm(options);

SEVER SIDE:

$output_dir = home_url()."/path/to/dir/";

if(isset($_FILES["profpic"])){
    if ($_FILES["profpic"]["error"] > 0){
      echo "Error: " . $_FILES["file"]["error"] . "
";
    }else{
        move_uploaded_file($_FILES["profpic"]["tmp_name"],$output_dir. $_FILES["profpic"]["name"]);
        if(get_user_meta($_SESSION['userid'], 'user_profile_picture')==""){
            add_user_meta($_SESSION['userid'], 'user_profile_picture', $_FILES['profpic']);
        }else{
            update_user_meta($_SESSION['userid'], 'user_profile_picture', $_FILES['profpic']);
        }
        echo "Uploaded File :".$_FILES["profpic"]["name"];
    }
}

它们只能在一个PHP文件中找到.该目录的文件夹权限是777.