PHP中的$ _file为什么这不起作用？

Question

I'm new to PHP and I wrote a simple code in PHP for file upload.but my code gives me an error.can someone help me to find the error here is my code
error gives as Undefined index

<?php

$name=$_FILES["file"]["name"];
$size=$_FILES['file']['size'];
$type=$_FILES['file']['type'];

?>

<form  action="unset.php"method="POST">
<input type="file" name="file"><br><br>
<input type="submit" value="submit">



</form>

Answer 1

Try this: PHP

<?php
if(isset($_POST['submit'])){
    echo $name=$_FILES["file"]["name"];
    echo $size=$_FILES['file']['size'];
    echo $type=$_FILES['file']['type'];
}

?>

HTML

<form  action="unset.php" method="POST" enctype="multipart/form-data">
    <input type="file" name="file"><br><br>
    <input type="submit" name="submit" value="submit">
</form>