Call a member function on a non object - php

Question

i want to display informations about object Activity that the function getCurrent() from the ListActivity should returns.
When i try it, it works perfectly, i have the information needed from the class, but, i have this error message on the top of the page :
Fatal error: Call to a member function getIdentifiant() on a
non-object in
/Applications/XAMPP/xamppfiles/htdocs/site/prototype/administration.php
on line 34
Line 34 is here :
while($listActivities->next())
{
$current = new Activity();
$current = $listActivities->getCurrent();
echo $current->getId(); // line 34
}
And this is the getCurrent() function which return an Activity object.
public function getCurrent()
{
if(isset($this->activities[$this->current]))
return $this->activities[$this->current];
}
I don't understand why i have this problem since it returns me the object that i want.
Please help me figuring it out. Thanks.

Answer 1

echo $current->getId(); // line 34
Fatal error: Call to a member function getIdentifiant() on a non-object in /Applications/XAMPP/xamppfiles/htdocs/site/prototype/administration.php on line 34
WhatEVER you think happens, or whatEVER you see in your page, if the error says $current is not an object, it is not. It might not be null, but it could also be an array or anything that is not an object.
Also :
$current = new Activity();
$current = $listActivities->getCurrent();
Doesn't really makes sense to me.
Use
var_dump($listActivities->getCurrent());
To see what it exactly returns, and trust what errors say.
EDIT : And you may not even be looking at the right php script acually : The error says "getIdentifiant" while the code says "getId". Make sure you're looking at the right piece of code and refreshing the right page.

Answer 2

first set $this->current after $current = new Activity(); (maybe in constercture)
and you should return false if !isset($this->activities[$this->current])
also if you use $current = $listActivities->getCurrent() you lost your Activity object , it should save into another variable
here new code :
while($listActivities->next())
{
$current = new Activity();
if( $listActivities->getCurrent() )
echo $current->getId(); // line 34
}
public function getCurrent()
{
if(isset($this->activities[$this->current]))
return $this->activities[$this->current];
return false;
}