[SOLVED] Php question about checking if a input="file" file exists

errigour · 12-10-2011, 08:12 PM

Hey I have had a problem about a php file called register.php that when the web browser directly asked to open register.php an error would display because no username was sent to the php file register.php. I fixed my syntax checking by using the code

PHP Code:



if (!isset($_POST["username"]) || !$_POST["username"])

Now I am having a similar problem while trying to create upload_file.php that uploads files but if someone accesses upload_file.php directly my new php server gives me a butt load of errors that insist that $_FILE['file'] is not defined. So I was wondering if any code show me how to properly check to see if $_FILE['file'] exists so that if it doesnt I could just print a message saying to make sure to enter a file and then exit the php script.

Below is the current php file that works but will print errors if accessed directly with a web browser. Also below that I am posting the html page so you guys can test if.

upload_file.php

PHP Code:



<?php 
if($_FILES["file"]["error"] > 0) 
{ 
    echo "Error: " . $_FILES["file"]["error"] . "<br>"; 
} 
else 
{ 
    if($_FILES["file"]["size"] > 570000) 
    { 
        echo "File size to exceeds 5.7 Megabytes"; 
        exit; 
    } 
    if(file_exists("uploads/" . $_FILES["file"]["name"])) 
    { 
        echo $_FILES["file"]["name"] . " already exists. "; 
        exit; 
    } 
    else 
    { 
        move_uploaded_file($_FILES["file"]["tmp_name"], "uploads/" . $_FILES['file']['name']); 
        echo "Upload   : " . ($_FILES["file"]["name"]) . "<br>"; 
        echo "Type     : " . ($_FILES["file"]["type"]) . "<br>"; 
        echo "Size     : " . ($_FILES["file"]["size"] / 1024) . " Kb<br>"; 
        echo "TMP File : " . $_FILES["file"]["tmp_name"] . "<br>"; 
        echo "Stored In: " . "uploads/" . $_FILES["file"]["name"]; 
  } 
}?>

upload_file.html

Code:

<html>
<head>
<title>Blank HTML</title>
<meta name="author" content="Eric Justin Allan">
<style type="text/css">
body 
{
	background-image: url('jpg/200829053409-8159.jpg');
	color:blue;
}
a 
{
	text-decoration:none;
	color:white;
}
</style>
</head>





<body>
	<p>Unpload files smaller then 5.7 megabytes preferably small files but definetly cool files
	<form action="upload_file.php" method="post" enctype="multipart/form-data">
	<font color="red">*</font>&nbsp; Filename:<input type="file" name="file" id="file" />
	<input type="submit" name="submit" value="Submit" /></form>
</body>
</html>

Cedrik · 12-11-2011, 04:32 AM

You could add a constant in every page where it is ok to access directly and test if this constant is defined in the pages that you don't want to be directly accessed, like:

In top of directly accessed pages:

PHP Code:



define("ACCESS", 1);

And in top of other pages:

PHP Code:



if (!defined('ACCESS')) {
    /* this is an example, you could also redirect to another page, 
       like index.php... */
    header("HTTP/1.1 403 Forbidden");
    exit(1);
}

errigour · 12-11-2011, 08:03 AM

It doesnt seem to be working

Cedrik · 12-11-2011, 08:37 AM

You put the 1st code in register.php and the 2nd in upload_file.php ?
Near the top, right after the <?php tag ?

errigour · 12-11-2011, 05:58 PM

Thankyou