尝试使用PHP获取非对象的属性

Question

I have a strange issue; my code is working on my localhost, but when I try to use it online. It's showing an error in the return line:

Trying to get property of non-object

Here is the code:

public static function displayContenuAsString ($id,$class="traduction survol_video",$div="div") {
        return "<$div id=\"contenu_$id\" class=\"$class\"></$div>".Contenu::model()->findByPk($id)->valeur;     
    }

Answer 1

No issues in the code Contenu::model()->findByPk($id)->valeur; Just check for the row in database with primary key.

Answer 2

According to documentation findByPk return the record found or Null if none is found. So you need to add check before using model values in this way:

public static function displayContenuAsString ($id,$class="traduction survol_video",$div="div") {
    $contenu = Contenu::model()->findByPk($id);
    $valeur = $contenu !== null ? $contenu->valeur : 'Empty';
    return "<$div id=\"contenu_$id\" class=\"$class\"></$div>".$valeur;     
}