问题描述:

You have a web page with a form that has an input field of type file. You have another web page that expects the data from the first page.

In the second page you need to check whether a file has been sent.

How do you do that?

I've been using the following statement but I'm not sure about it:

$_FILES["file"]["tmp_name"] == ""

网友答案:
  • http://www.w3schools.com/php/php_file_upload.asp

    <?php
    if ($_FILES["file"]["error"] > 0)
    {
        echo "Error: " . $_FILES["file"]["error"] . "<br />";
    }
    else
    {
        echo "Upload: " . $_FILES["file"]["name"] . "<br />";
        echo "Type: " . $_FILES["file"]["type"] . "<br />";
        echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
        echo "Stored in: " . $_FILES["file"]["tmp_name"];
    }
    ?>
    
网友答案:

Try array_key_exists("file", $_FILES)

网友答案:

I don't work with PHP file uploads often, but is there any reason that:

isset($_FILES['file'])

won't do the trick?

网友答案:

Or you could just check if $_FILES is empty.

if(empty($_FILES))
{
return false; // or make something else
}
相关阅读:
Top