Explanation of error in php $_file

When uploading files using PHP, we will use a program to monitor the file information sent by the browser. First, we will judge whether the status of the file to be uploaded is normal through the different values ​​​​of $_FILES[fieldName]['error']. $_FILES[fieldName] ['error']==0 means everything is normal. For the specific meaning of other values, please refer to the comment section of the program below!

switch($_FILES[$field]['error']) {  
    case 1:    
// 文件大小超出了服务器的空间大小    
break;   
case 2:    
// 要上传的文件大小超出浏览器限制    
$this->setError("The file is too large (form).");    
break;    
case 3:    
// 文件仅部分被上传    
$this->setError("The file was only partially uploaded.");    
break;    
case 4:    
// 没有找到要上传的文件    
break;    
case 5:    
// 服务器临时文件夹丢失    
break;    
case 6:    
// 文件写入到临时文件夹出错    
break;    
}