CODEWITHSUNDEEP
phpwindowsapachewamp
Bv202
Bv202

Reputation: 4044

file_exists() returns false, but the file DOES exist

I'm having a very weird issue with file_exists(). I'm using this function to check if 2 different files in the same folders do exist. I've double-checked, they BOTH do exist.

echo $relative . $url['path'] . '/' . $path['filename'] . '.jpg';
Result: ../../images/example/001-001.jpg

echo $relative . $url['path'] . '/' . $path['filename'] . '.' . $path['extension'];
Result: ../../images/example/001-001.PNG

Now let's use file_exists() on these:

var_dump(file_exists($relative . $url['path'] . '/' . $path['filename'] . '.jpg'));
Result: bool(false)

var_dump(file_exists($relative . $url['path'] . '/' . $path['filename'] . '.' . $path['extension']));
Result: bool(true)

I don't get it - both of these files do exist. I'm running Windows, so it's not related to a case-sensitive issue. Safe Mode is off.

What might be worth mentioning though is that the .png one is uploaded by a user via FTP, while the .jpg one is created using a script. But as far as I know, that shouldn't make a difference.

Any tips?

Thanks

Upvotes: 48

Views: 86107

Answers (15)

Stanley Aloh
Stanley Aloh

Reputation: 437

I just encountered this same problem and I solved it in a mysterious way. After inserting a a filepath I copied from Windows File explorer. file_exists() keeps returning false continuously, but if I copy same path from VSCode editor it works perfectly.

After dumping variables with var_dump($path); I noticed something mysterious. For path I copied from file explorer it shows length 94. For path I copied from VSCode Editor it shows length 88.

Both path look same length on my code Editor.

My suggestion: if string contain hidden characters, it may fail and not work.

Upvotes: 0

Doug
Doug

Reputation: 6442

Try using DIRECTORY_SEPARATOR instead of '/' as separator. Windows uses a different separator for file system paths (backslash) than Linux and Unix systems.

Upvotes: 5

WoodrowShigeru
WoodrowShigeru

Reputation: 1594

In my case, the problem was a misconception of how file_exists() behaves with symbolic links and .. ("dotdot" or double period) parent dir references. In that regard, it differs from functions like require, include or even mkdir().

Given this directory structure:

/home/me/work/example/
  www/
/var/www/example.local/
  tmp/
  public_html -> /home/me/work/example/www/

file_exists('/var/www/example.local/public_html/../tmp/'); would return FALSE even though the subdir exists as we see, because the function traversed up into /home/me/work/example/ which does not have that subdir.

For this reason, I have created this function:

/**
 * Resolve any ".." ("dotdots" or double periods) in a given path.
 *
 * This is especially useful for avoiding the confusing behavior `file_exists()`
 * shows with symbolic links.
 *
 * @param string $path
 *
 * @return string
 */
function resolve_dotdots( string $path ) {

    if (empty($path)) {
        return $path;
    }

    $source = array_reverse(explode(DIRECTORY_SEPARATOR, $path));
    $balance = 0;
    $parts = array();

    // going backwards through the path, keep track of the dotdots and "work
    // them off" by skipping a part. Only take over the respective part if the
    // balance is at zero.
    foreach ($source as $part) {
        if ($part === '..') {
            $balance++;

        } else if ($balance > 0) {
            $balance--;

        } else {
            array_push($parts, $part);
        }
    }

    // special case: path begins with too many dotdots, references "outside
    // knowledge".
    if ($balance > 0) {
        for ($i = 0; $i < $balance; $i++) {
            array_push($parts, '..');
        }
    }

    $parts = array_reverse($parts);
    return implode(DIRECTORY_SEPARATOR, $parts);
}

Upvotes: 0

Mahdi Loghmani
Mahdi Loghmani

Reputation: 401

file_exists() just doesn't work with HTTP addresses.

It only supports filesystem paths (and FTP, if you're using PHP5.)

Please note:

Works :

if  (file_exists($_SERVER['DOCUMENT_ROOT']."/folder/test.txt") 
    echo "file exists";

Does not work:

if (file_exists("www.mysite.com/folder/test.txt") 
    echo "file exists";

Upvotes: 38

Shahar
Shahar

Reputation: 2347

I found that what works for me to check if a file exists (relative to the current php file it is being executed from) is this piece of code:

$filename = 'myfile.jpg';
$file_path_and_name = dirname(__FILE__) . DIRECTORY_SEPARATOR . "{$filename}";
if ( file_exists($file_path_and_name) ){
  // file exists. Do some magic...              
} else {
  // file does not exists...
}

Upvotes: 14

ace
ace

Reputation: 7583

It's because of safe mode. You can turn it off or include the directory in safe_mode_include_dir. Or change file ownership / permissions for those files.

php.net: file_exists()
php.net: safe mode

Upvotes: 12

Irshad Khan
Irshad Khan

Reputation: 6036

I spent the last two hours wondering what was wrong with my if statement: file_exists($file) was returning false, however I could call include($file) with no problem.

It turns out that I didn't realize that the php include_path value I had set in the .htaccess file didn't carry over to file_exists, is_file, etc.

Thus:

<?PHP
// .htaccess php_value include_path '/home/user/public_html/';

// includes lies in /home/user/public_html/includes/

//doesn't work, file_exists returns false
if ( file_exists('includes/config.php') )
{
     include('includes/config.php');
}

//does work, file_exists returns true
if ( file_exists('/home/user/public_html/includes/config.php') )
{
    include('includes/config.php');
}
?>

Just goes to show that "shortcuts for simplicity" like setting the include_path in .htaccess can just cause more grief in the long run.

Upvotes: 1

scipilot
scipilot

Reputation: 7447

I have a new reason this happens - I am using PHP inside a Docker container with a mounted volume for the codebase which resides on my local host machine.

I was getting file_exists == FALSE (inside Composer autoload), but if I copied the filepath into terminal - it did exist! I tried the clearstatche(), checked safe-mode was OFF.

Then I remembered the Docker volume mapping: the absolute path on my local host machine certainly doesn't exist inside the Docker container - which is PHP's perspective on the world.

(I keep forgetting I'm using Docker, because I've made shell functions which wrap the docker run commands so nicely...)

Upvotes: 2

kiko carisse
kiko carisse

Reputation: 1784

This answer may be a bit hacky, but its been working for me -

$file = 'path/to/file.jpg';
$file = $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].'/'.$file;
$file_headers = @get_headers($file);
if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
    $exists = false;
}else{
    $exists = true;
}

apparently $_SERVER['REQUEST_SCHEME'] is a bit dicey to use with IIS 7.0 + PHP 5.3 so you could probably look for a better way to add in the protocol.

I found this answer here http://php.net/manual/en/function.file-exists.php#75064

Upvotes: 0

Mangilal Sharma
Mangilal Sharma

Reputation: 57

A very simple trick is here that worked for me.

When I write following line, than it returns false.

if(file_exists('/my-dreams-files/'.$_GET['article'].'.html'))

And when I write with removing URL starting slash, then it returns true.

if(file_exists('my-dreams-files/'.$_GET['article'].'.html'))

Upvotes: 2

Julien Ricard
Julien Ricard

Reputation: 314

It can also be a permission problem on one of the parent folders or the file itself.

Try to open a session as the user running your webserver and cd into it. The folder must be accessible by this user and the file must be readable.

If not, php will return that the file doesn't exist.

Upvotes: 1

RafaSashi
RafaSashi

Reputation: 17205

A custom_file_exists() function inspired by @Timur, @Brian, @Doug and @Shahar previous answers:

function custom_file_exists($file_path=''){
    $file_exists=false;

    //clear cached results
    //clearstatcache();

    //trim path
    $file_dir=trim(dirname($file_path));

    //normalize path separator
    $file_dir=str_replace('/',DIRECTORY_SEPARATOR,$file_dir).DIRECTORY_SEPARATOR;

    //trim file name
    $file_name=trim(basename($file_path));

    //rebuild path
    $file_path=$file_dir."{$file_name}";

    //If you simply want to check that some file (not directory) exists, 
    //and concerned about performance, try is_file() instead.
    //It seems like is_file() is almost 2x faster when a file exists 
    //and about the same when it doesn't.

    $file_exists=is_file($file_path);

    //$file_exists=file_exists($file_path);

    return $file_exists;
}

Upvotes: 0

Brian
Brian

Reputation: 418

Just my $.02: I just had this problem and it was due to a space at the end of the file name. It's not always a path problem - although that is the first thing I check - always. I could cut and paste the file name into a shell window using the ls -l command and of course that locates the file because the command line will ignore the space where as file_exists does not. Very frustrating indeed and nearly impossible to locate were it not for StackOverflow.

HINT: When outputting debug statements enclose values with delimiters () or [] and that will show a space pretty clearly. And always remember to trim your input.

Upvotes: 12

amigura
amigura

Reputation: 139

have you tried manual entry. also your two extensions seem to be in different case

   var_dump(file_exists('../../images/example/001-001.jpg'));
   var_dump(file_exists('../../images/example/001-001.PNG'));

Upvotes: 0

Timur
Timur

Reputation: 6718

Results of the file_exists() are cached, so try using clearstatcache(). If that not helped, recheck names - they might be similar, but not same.

Upvotes: 30

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