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Modificatori

I modificatori sono piccole funzioni che vengono applicate ad una variabile del template prima che venga visualizzata o usata in qualche altro contesto. I modificatori possono essere concatenati.

mixed smarty_modifier_name( $value,  
  $param1);  
mixed $value;
[mixed $param1, ...];
 

Il primo parametro passato al plugin modificatore è il valore sul quale il modificatore stesso deve operare. Gli altri parametri possono essere opzionali, a seconda del tipo di operazione che deve essere eseguita.

Il modificatore deve restituire il risultato della sua esecuzione.

Vedere anche register_modifier(), unregister_modifier().

Example 16.3. un semplice plugin modificatore

Questo plugin fondamentalmente crea un sinonimo per una delle funzioni incorporate in PHP. Non prevede parametri aggiuntivi.


<?php
/*
 * Smarty plugin
 * -------------------------------------------------------------
 * File:     modifier.capitalize.php
 * Type:     modifier
 * Name:     capitalize
 * Purpose:  capitalize words in the string
 * -------------------------------------------------------------
 */
function smarty_modifier_capitalize($string)
{
    return ucwords($string);
}
?>


Example 16.4. un plugin modificatore più complesso


<?php
/*
 * Smarty plugin
 * -------------------------------------------------------------
 * File:     modifier.truncate.php
 * Type:     modifier
 * Name:     truncate
 * Purpose:  Truncate a string to a certain length if necessary,
 *           optionally splitting in the middle of a word, and 
 *           appending the $etc string.
 * -------------------------------------------------------------
 */
function smarty_modifier_truncate($string, $length = 80, $etc = '...',
                                  $break_words = false)
{
    if ($length == 0)
        return '';

    if (strlen($string) > $length) {
        $length -= strlen($etc);
        $fragment = substr($string, 0, $length+1);
        if ($break_words)
            $fragment = substr($fragment, 0, -1);
        else
            $fragment = preg_replace('/\s+(\S+)?$/', '', $fragment);
        return $fragment.$etc;
    } else
        return $string;
}
?>

     

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