Multiple File Exists Checking? A Better way?

I have a script. It recieves a variable called $node, which is a string; for now, lets assume the variable value is "NODEVALUE". When the script is called, it takes the variable $node, and tries to find an image called NODE开发者_开发知识库VALUE.png. If it cant find that image, it then checks for NODEVALUE.jpg, if it can't find that it looks for NODEVALUE.gif... and after all that, it still cant find, it returns RANDOM.png.

Right now I am doing this script as follows:

if (file_exists($img = $node.".png")) {  }
else if (file_exists($img = $node.".jpg")) {  }
else if (file_exists($img = $node.".gif")) {  }
else
{
    $img = 'RANDOM.png';
}

There has to be a better way than this... anyone have any ideas?

---

$list = array_filter(array("$node.png", "$node.jpg", "$node.gif"), 'file_exists');
if (!$img = array_shift($list)) {
    $img = 'RANDOM.png';
}

Alternatives :

$list = scandir(".");
$list = preg_grep("#".preg_quote($node,'#')."\.(jpg|png|gif)$#", $list);

This returns a list of file names that start with $node and with a .jpg, .png or .gif suffix.

If the directory contains many entries, if may be faster to use glob() first:

$list = glob("$node.*"); // take care to escape $node here
$list = preg_grep("#".preg_quote($node,'#')."\.(jpg|png|gif)$#");

The preg_grep() can also be replaced by

$list = array_intersect($list, array("$node.png", "$node.jpg", "$node.gif"));

Or with a loop:

$img = null;
foreach(array('png','jpg','gif') as $ext) {
    if (!file_exists("$node.$ext")) continue;
    $img = "$node.$ext"; break;
}
$img = $img ? $img : "RANDOM.png";

---

The most compact (and therefore not recommended) form would be:

if (array_sum(array_map("file_exists", array($fn1, $fn2, $fn3)))) {

It could be adapted to also returning the found filename using array_search:

array_search(1, array_map("file_exists", array($fn1=>$fn1, $fn2=>$fn2)))

Hardly readable. Note how it also requires a map like array("$node.png"=>"$node.png", "$node.gif"=>"$node.gif", ...). So it would not be that much shorter.

---

$n_folder="images/nodes/";
$u_folder="images/users/";
     $extensions=array(".png",".jpg",".gif");

foreach ($extensions as $ext)
{
    if (file_exists($n_folder.$node.$ext))
    {
     $img=$n_folder.$node.$ext;
     break;
    }
    elseif (file_exists($u_folder.$node.$ext))
    {
      $img=$u_folder.$node.$ext;
     break;
    }
}

if (!$img)
{
    random image generator script...
}

---

Okay... this is what I finalized on:

$searches = array(
    $folder . "nodes/" . $node . ".png",
    $folder . "nodes/" . $node . ".jpg",
    $folder . "nodes/" . $node . ".gif",
    $folder . "users/" . $user . ".png",
    $folder . "users/" . $user . ".jpg",
    $folder . "users/" . $user . ".gif"
);

foreach ($searches AS $search)
{
    if (file_exists($search))
    {
        $img = $search;
        break;
    }
}

if (!$img)
{
    random image generator script...
}