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Modifiers

Modificadores são funções que são aplicadas a uma variável no template antes dela ser mostrada ou usada em algum outro contexto. Modificadores podem ser encadeados juntos.

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

O primeiro parâmetro para o plugin midificador é o valor em que o modificador é suposto operar. O resto dos parâmetros podem ser opcionais, dependendo de qual tipo de operação é para ser executada.

O modificador deve retornar o resultado de seu processamento.

Veja também: register_modifier(), unregister_modifier().

Example 16.3. Plugin modificador simples

Este plugin basiamente é um alias de uma função do PHP. Ele não tem nenhum parâmetro adicional.

<?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. Plugin modificador mais complexo

<?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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