如何使用 URL 检查 smarty 上是否存在图像文件？

Question

I want to check if the webp image is exists on the server on smarty . The URL is an absolute URL like this .

i tried

{if file_exists("https://example.com/image.webp")}
{/if}

and

{if 'https://example.com/image.webp'}

{/if}

But none is working. Can anyone tell me how to do this?

Answer 1

In your controller, you should do something like:

if (file_exists($filename))

You could also do this in the view as you're trying to do now, but it's recommended to keep your logic separated from your view.

Don't forget to add the absolute path to the $filename variable.

Edit :

In case of smarty, you can do the following in your php script:

    $smarty = new Smarty();
    
    $fileExist = false;
    if (file_exists($filename)) {
      $fileExists = true;
    }

    $smarty->assign('fileExists', $fileExists);
    
    $smarty->display('index.tpl');

In the view/template, you can then simply do:

{if $fileExists}

Answer 2

In smarty, you cannot use file_exists() on a URL, but you can use it on a local file

I think, the best way is to check in your controller.

1st method:

In your controller, you can write something like that (path only): https://www.php.net/manual/fr/function.file-exists.php

$filename = '/example.com/image.webp'
if(!file_exist($filename))
    $filename = '/example.com/other_image.webp'

Then return the variable $filename

Other way :

If you want to check that the image exists from a URL then you should use this:

$file = 'http://www.example.com/somefile.jpg';
$file_headers = @get_headers($file);
if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
    $exists = false;
}
else {
    $exists = true;
}

then //do something...

Answer 3

You Have To Check File IN file_exists("var/www/html/example.com/image.webp") it will note Check Http or Https