CODEWITHSUNDEEP
phpheaderhttp-status-code-404
Yrrol
Yrrol

Reputation:

Why won't my PHP app send a 404 error?

if (strstr($_SERVER['REQUEST_URI'],'index.php')) {
    header('HTTP/1.0 404 Not Found');
}

Why wont this work? I get a blank page.

Upvotes: 141

Views: 147311

Answers (16)

Mohammad Farhoudi
Mohammad Farhoudi

Reputation: 11

Try this:

if (strstr($_SERVER['REQUEST_URI'],'index.php')) {
    header('HTTP/1.0 404 Not Found');
    echo "<head><title>404 Not Found</title></head>";
    echo "<h1>Not Found</h1>";
    $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
    echo "<p>The requested URL ".$uri." was not found on this server.</p>";
    exit();
}

Upvotes: 1

rparker
rparker

Reputation: 143

Since php 5.4 you can now do http_response_code(404);

Upvotes: 12

Olaf Erlandsen
Olaf Erlandsen

Reputation: 6036

try with:

header("Status: 404 Not Found");
header('HTTP/1.0 404 Not Found');

Bye!

Upvotes: 4

GGG
GGG

Reputation: 670

You know, in my website i created something like this:

        $uri=$_SERVER['REQUEST_URI'];
        $strpos=strpos($uri, '.php');
        if ($strpos!==false){
        $e404="The page requested by you: &quot".$_SERVER['REQUEST_URI']."&quot, doesn't exists on this server.";
        $maybe=str_replace('.php','',$uri);
        $maybe=str_replace('/','',$maybe);
        die("<center><h1>404</h1><hr><h3>$e404</h3><h3>Maybe try <a href=$maybe>www.leaveyortexthere.p.ht/$maybe</a>?</center>");

}

i hope it helps you.

Upvotes: 0

Jacob Stazewski
Jacob Stazewski

Reputation: 11

You're doing it right though it could use some refining. Looks like that's been addressed so let's talk practical application benefits:

An old website of ours that has a large collection of multilingual tech docs was executing this inside an if else conditional:

    if (<no file found>){
        die("NO FILE HERE");
    }

The problem (besides the unhelpful message and bad user experience) being that we generally use a link crawler (in our case integrity) to check out bad links and missing documents. This means that we were getting a perfectly correct 200 no error response telling us that there was a file there. Integrity didn't know that we were expecting a PDF so we had to manually add a 404 header with php. By adding your code above the die (because nothing afterwards would execute and header should always be before any rendered html anyway), integrity (which behaves more or less like a browser) would return a 404 and we would know exactly where to look for missing files. There are more elegant ways of telling the user that there is an error, but by serving a 404 error you are not only notifying browsers and browser-like programs of the error but (I believe-correct me if I'm wrong) are also recording those errors in your server logs where you can easily grep for 404s.

    header('HTTP/1.0 404 Not Found');
    die("NO FILE HERE");

Upvotes: 1

Earth Engine
Earth Engine

Reputation: 10426

Another solution, based on @Kitet's.

header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
header("Status: 404 Not Found");

$_SERVER['REDIRECT_STATUS'] = 404;
//If you don't know which web page is in use, use any page that doesn't exists
$handle = curl_init('http://'. $_SERVER["HTTP_HOST"] .'/404missing.html');
curl_exec($handle);

If you are programming a website that hosted in a server you do not have control, you will not know which file is the "404missing.html". However you can still do this.

In this way, you provided exactly the same outcome of a normal 404 page on the same server. An observer will not be able to distinguish between an existing PHP page returns 404 and a non-existing page.

Upvotes: 4

Silviu-Marian
Silviu-Marian

Reputation: 10907

For the record, this is the all-case handler:

<?php
header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
header("Status: 404 Not Found");

$_SERVER['REDIRECT_STATUS'] = 404;
?> <!-- 404 contents below this line -->

Upvotes: 16

cicada
cicada

Reputation: 1

If you want to show the server’s default 404 page, you can load it in a frame like this:

echo '<iframe src="/something-bogus" width="100%" height="100%" frameBorder="0" border="0" scrolling="no"></iframe>';

Upvotes: -17

Evan Fosmark
Evan Fosmark

Reputation: 101651

if (strstr($_SERVER['REQUEST_URI'],'index.php')){
    header('HTTP/1.0 404 Not Found');
    echo "<h1>404 Not Found</h1>";
    echo "The page that you have requested could not be found.";
    exit();
}

If you look at the last two echo lines, that's where you'll see the content. You can customize it however you want.

Upvotes: 77

Jesse
Jesse

Reputation: 21

if($_SERVER['PHP_SELF'] == '/index.php'){ 
   header('HTTP/1.0 404 Not Found');
   echo "<h1>404 Not Found</h1>";
   echo "The page that you have requested could not be found.";
   die;
}

never simplify the echo statements, and never forget the semi colon like above, also why run a substr on the page, we can easily just run php_self

Upvotes: 2

Bob Fanger
Bob Fanger

Reputation: 29897

That is correct behaviour, it's up to you to create the contents for the 404 page.
The 404 header is used by spiders and download-managers to determine if the file exists.
(A page with a 404 header won't be indexed by google or other search-engines)

Normal users however don't look at http-headers and use the page as a normal page.

Upvotes: 74

GorillaApe
GorillaApe

Reputation: 3641

I came up to this problem.. I think that redirecting to a non existing link on your server might do the trick ! Because the server would return his 404:
header('Redirect abbb.404.nonexist'); < that doesnt exist for sure

Upvotes: -4

Kitet
Kitet

Reputation: 141

Load default server 404 page, if you have one, e.g. defined for apache:

if(strstr($_SERVER['REQUEST_URI'],'index.php')){
  header('HTTP/1.0 404 Not Found');
  readfile('404missing.html');
  exit();
}

Upvotes: 14

user347726
user347726

Reputation:

A little bit shorter version. Suppress odd echo.

if (strstr($_SERVER['REQUEST_URI'],'index.php')){
  header('HTTP/1.0 404 Not Found');
  exit("<h1>404 Not Found</h1>\nThe page that you have requested could not be found.");
}

Upvotes: 2

Alana Storm
Alana Storm

Reputation: 166046

Your code is technically correct. If you looked at the headers of that blank page, you'd see a 404 header, and other computers/programs would be able to correctly identify the response as file not found.

Of course, your users are still SOL. Normally, 404s are handled by the web server.

  • User: Hey, do you have anything for me at this URI webserver?
  • Webserver: No, I don't, 404! Here's a page to display for 404s.

The problem is, once the web server starts processing the PHP page, it's already passed the point where it would handle a 404

  • User: Hey, do you have anything for me at this URI webserver?
  • Webserver: Yes, I do, it's a PHP page. It'll tell you what the response code is
  • PHP: Hey, OMG 404!!!!!!!
  • Webserver: Well crap, the 404 page people have already gone home, so I'll just send along whatever PHP gave me

In addition to providing a 404 header, PHP is now responsible for outputting the actual 404 page.

Upvotes: 308

Gumbo
Gumbo

Reputation: 655129

If you want the server’s default error page to be displayed, you have to handle this in the server.

Upvotes: 1

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