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my first plugin function - does file exist?

 
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FSSmariani
Smarty n00b


Joined: 26 Jan 2021
Posts: 2

PostPosted: Mon Apr 19, 2021 9:09 pm    Post subject: my first plugin function - does file exist? Reply with quote

Good day all.

I have written my *first* Smarty plugin function. Unfortunately, it doesn't work (yet!).

I created smarty_plugins/function.file_exists.php to return a boolean if the product image file exists.


Code:

<?php
/*
 * Smarty plugin
 * -------------------------------------------------------------
 * File:     function.file_exists.php
 * Type:     function
 * Name:     file_exists
 * Purpose:  returns boolean based on existance of product image file
 * -------------------------------------------------------------
 * Date       Who   Why
 * 2021-04-19 MEM   Per Eventum #3060.
 * -------------------------------------------------------------
 */
function smarty_function_file_exists($filename, $smarty)
{
  $smarty->assign($filefound,0);
  if (file_exists('/images/products/$filename'))
    {
    $smarty->assign($filefound,1);
    }
}
?>


I tried calling it from .tpl as:
Code:

{if file_exists('/images/products/{$product->mProduct[k].image}')}
     <div><img src='/images/products/{$product->mProduct[k].image}' alt="FSS product {$product->mProduct[k].code}" width="80" height="80" onError="this.visible=false;" /></div>
    {else}
      <div><img src='/images/not-available.jpg' alt="FSS product {$product->mProduct[k].code}" width="80" height="80" onError="this.visible=false;" /></div>
        {/if}


I wasn't sure if I needed to register this, since I believe I used the correct directory and naming convention. Do I?

Is the syntax wrong?

When I execute, I get the default image for all products.

I added the $smarty argument and $smarty->assign statement, but see other examples that don't seem to have these. So, I am little confused.

Thanks for your advice.
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AnrDaemon
Administrator


Joined: 03 Dec 2012
Posts: 1728

PostPosted: Tue Apr 20, 2021 4:11 pm    Post subject: Reply with quote

You've called PHP native function.
What you created is a template function {file_exists}.
Which is rather useless. You shouldn't check that in your template. More than that, you shouldn't ever make tests like that in your PHP code.
What if static files are served from a different server?
Just don't do that.
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