Worry in the backoffice of my module undefined index prestashop - module

Question

I developed a prestashop module, when I am in the backoffice of my module, I have many with errors:
Notice à la ligne 30 du fichier
C:\xampp2\htdocs\projet_presta\app\cache\dev\smarty\compile\86\1c\1c\861c1cb1906b13002a1460e54203e8a370598366.file.displayContent.tpl.php
[8] Undefined index: avisnote Notice à la ligne 30 du fichier
C:\xampp2\htdocs\projet_presta\app\cache\dev\smarty\compile\86\1c\1c\861c1cb1906b13002a1460e54203e8a370598366.file.displayContent.tpl.php
[8] Trying to get property of non-object
in my module avisnote.php file:
public function displayContent()
{
$avisnote = Db::getInstance()->executeS('SELECT * FROM `'._DB_PREFIX_.'avisnote` LIMIT 1');
print_r($avisnote);
foreach ($avisnote as $row)
{
$file = $row['url'];
$state = $row['etat'];
}
if(isset($fileContent) && !empty($fileContent))
{
$fileContent = file_get_contents($file, NULL, NULL);
$var_sep = explode(";", $fileContent);
$nb_avis = $var_sep[0];
$note = $var_sep[1];
$this->context->$smarty->assign('avisnote',
array('nb_avis' => $nb_avis,
'note'=>$note,
'etat'=>$state));
}
return $this->display(__FILE__,'views/templates/hook/displayContent.tpl');
}
the paths of my files:
avisnote.php : Modules/avisnote/
displayContent.tpl : Modules/avisnote/views/templates/hook/
displayContent.tpl:
<p></p>
<div itemprop="itemreviewed" itemscope="" itemtype="http://data-vocabulary.org/Review-aggregate">
<span itemprop="itemreviewed">Mywebsite</span> <span itemprop="rating" itemscope="" itemtype="http://data-vocabulary.org/Rating"> <span itemprop="average">{$avisnote.note}</span> sur <span itemprop="best">5</span> </span>
<br />basé sur <span itemprop="votes">{$avisnote.nb_avis}</span> avis Avis Vérifiés</div>
</div>

Answer 1

You have at least 2 errors in your code.
First you check if isset($fileContent) then use the variable $file. Second, you have $this->context->$smarty ... Your code fixed should be more like:
public function displayContent()
{
$avisnote = Db::getInstance()->executeS('SELECT * FROM `'._DB_PREFIX_.'avisnote` LIMIT 1');
print_r($avisnote);
foreach ($avisnote as $row)
{
$file = $row['url'];
$state = $row['etat'];
}
$nb_avis = $note = $state = '';
if(isset($file) && !empty($file))
{
$fileContent = file_get_contents($file, NULL, NULL);
$var_sep = explode(";", $fileContent);
$nb_avis = $var_sep[0];
$note = $var_sep[1];
}
$this->context->smarty->assign('avisnote',
array('nb_avis' => $nb_avis,
'note'=>$note,
'etat'=>$state));
return $this->display(__FILE__,'views/templates/hook/displayContent.tpl');
}