php - 未定义的索引：文件在

Question

我正在尝试修复错误Undefined index: file in。

这是我的代码：

if (isset($_FILES['picture'])) {

}

mysqli_query($con,"INSERT INTO events (title, text, picture) VALUES 
('".$_POST["title"]."','".$_POST["text"]."','".addslashes("" . $_FILES["file"] 
["name"])."')");

$allowedExts = array("jpg", "jpeg", "gif", "png");
$tmp = (explode(".", $_FILES["file"]["name"]));
$extension = end($tmp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/png")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 20000)
&& in_array($extension, $allowedExts))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . $_FILES["file"]["size"] . " kB<br>";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";

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


mysqli_close($con);

?>

Answer 1

你应该在

$_FILES['picture']

和

$_FILES['file']

这可能是您的错误的来源。

Answer 2

如果您的文件输入元素名称是文件<input type='file' name='file'>

if (isset($_FILES['file'])) {

    //code goes here

}