文件上传空字符串

Question

上传一个图像到一个目录，它似乎总是尝试上传“”这是什么。而不是实际的图像。我在下面做什么。我知道值是“”，因为它插入到数据库中。

<li class="formProductImage"> 
<span>Image:</span> 
<input type="file" name="productImage" /> 
</li> 

和PHP：

if ($_FILES["productImage"]["error"] > 0) 
    { 
     echo "Return Code: " . $_FILES["productImage"]["error"] . "<br />"; 
    } 
else 
    { 
    echo "Upload: " . $_FILES["productImage"]["name"] . "<br />"; 
    echo "Type: " . $_FILES["productImage"]["type"] . "<br />"; 
    echo "Size: " . ($_FILES["productImage"]["size"]/1024) . " Kb<br />"; 
    echo "Temp file: " . $_FILES["productImage"]["tmp_name"] . "<br />"; 
    $filename = mysql_real_escape_string($_FILES['productImage']['name']); 

     $query = "UPDATE products SET image = '$filename' WHERE name = '$name'"; 
     $result = mysql_query($query); 

     if (mysql_affected_rows() == 1) { 
      // Show thank you message 
      echo '<span style="color:green;">Your image was added to database correctly.</span>'; 

      if (file_exists("uploaded/" . $_FILES["productImage"]["name"])) 
      { 
       echo $_FILES["productImage"]["name"] . " already exists. "; 
      } 
      else 
      { 
       move_uploaded_file($_FILES["productImage"]["tmp_name"], 
       "uploaded/" . $_FILES["productImage"]["name"]); 
       echo "Stored in: " . "uploaded/" . $_FILES["productImage"]["name"]; 
      } 

     } else { 
      echo '<font color="red">Image note inserted into database.</font>'; 
      echo mysql_error(); 
     } 

    } 
        } 

         } 

Answer 1

请确保您有在<form>标签enctype="multipart/form-data"。

Answer 2

改变这一行：

$filename = mysql_real_escape_string($_FILES['file']['name']); 

到：

$filename = mysql_real_escape_string($_FILES['productImage']['name']);