extend_prestashop_smarty.php

<?php
/*
 * Sources: 
 *  http://blog.dev-net.fr/ajoutez-vos-propres-fonctions-a-smarty-depuis-un-module-prestashop/
 *  http://www.smarty.net/forums/viewtopic.php?p=23628#23628
*/
if (!defined('_PS_VERSION_'))
  exit;
 
class extend_prestashop_smarty extends Module
{
  public function __construct()
  {
    $this->name = 'extend_prestashop_smarty';
    $this->tab = 'front_office_features';
    $this->version = '0.0.1';
    $this->author = 'Johan VIVIEN';
    $this->need_instance = 0;
    $this->ps_versions_compliancy = array('min' => '1.6', 'max' => _PS_VERSION_); 
    $this->bootstrap = true;
 
    parent::__construct();
 
    $this->displayName = $this->l('Extend Smarty');
    $this->description = $this->l('Description of my module.');
 
    $this->confirmUninstall = $this->l('Are you sure you want to uninstall?');
 
    if (!Configuration::get('extend_prestashop_smarty'))      
      $this->warning = $this->l('No name provided');
  }

  public function install()
  {
    if (!parent::install()) 
      return false;

    if  (!$this->registerHook('header')) 
      return false;

    return true;
  }

  public function uninstall()
  {
    if ( !parent::uninstall())
        return false;
   
    return true;  
  }  

  public function hookHeader($params)
  {
    global $smarty;

    smartyRegisterFunction($smarty, 'function', 'sortby', array(&$this,'smarty_modifier_sortby'));

  }

  public function array_sort_by_fields(&$data, $sortby){
    static $sort_funcs = array();
       
      if (empty($sort_funcs[$sortby]))
      {
          $code = "\$c=0;";
          foreach (split(',', $sortby) as $key)
          {
             $d = '1';
                if (substr($key, 0, 1) == '-')
                {
                   $d = '-1';
                   $key = substr($key, 1);
                }
                if (substr($key, 0, 1) == '#')
                {
                   $key = substr($key, 1);
                 $code .= "if ( ( \$c = (\$a['$key'] - \$b['$key'])) != 0 ) return $d * \$c;\n";
                }
                else
                {
                 $code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return $d * \$c;\n";
              }
          }
          $code .= 'return $c;';
          $sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
      }
      else
      {
          $sort_func = $sort_funcs[$sortby];
      }   
      uasort($data, $sort_func);   
  }

  #
  # Modifier: sortby - allows arrays of named arrays to be sorted by a given field
  #
  public function smarty_modifier_sortby($arrData,$sortfields) {
    $this->array_sort_by_fields($arrData,$sortfields);
    return $arrData;
  } 



}

Salut,
Je n'ai plus l'accès à l'admin du blog de devnet pour valider ton post.
Mais comme c'est une réponse à mon post initial j'ai eu ton commentaire par mail.
Voici ton problème :
Tu utilises une globale pour smarty : $smarty.
Depuis la 1.5 , la classe module possède sa propre propriété smarty.
Ta fonction devient donc simplement :
public function hookHeader($params) { smartyRegisterFunction($this->smarty, 'function', 'sortby', array(&$this,'smarty_modifier_sortby')); }