I've got a problem:
I'm writing a new WebApp without a Framework.
In my index.php I'm using: require_once('load.php');
And in load.php I'm using require_once('class.php');
to load my class.php.
In my class.php I've got this error:
Fatal error: Using $this when not in object context in class.php on line ... (in this example it would be 11)
An example how my class.php is written:
class foobar {
public $foo;
public function __construct() {
global $foo;
$this->foo = $foo;
}
public function foobarfunc() {
return $this->foo();
}
public function foo() {
return $this->foo;
}
}
In my index.php I'm loading maybe foobarfunc()
like this:
foobar::foobarfunc();
but can also be
$foobar = new foobar;
$foobar->foobarfunc();
Why is the error coming?
This question is related to
php
function
class
object
fatal-error
$foobar = new foobar;
put the class foobar in $foobar, not the object. To get the object, you need to add parenthesis: $foobar = new foobar();
Your error is simply that you call a method on a class, so there is no $this
since $this
only exists in objects.
If you are invoking foobarfunc
with resolution scope operator (::
), then you are calling it statically, e.g. on the class level instead of the instance level, thus you are using $this
when not in object context. $this
does not exist in class context.
If you enable E_STRICT
, PHP will raise a Notice about this:
Strict Standards:
Non-static method foobar::foobarfunc() should not be called statically
Do this instead
$fb = new foobar;
echo $fb->foobarfunc();
On a sidenote, I suggest not to use global
inside your classes. If you need something from outside inside your class, pass it through the constructor. This is called Dependency Injection and it will make your code much more maintainable and less dependant on outside things.
It seems to me to be a bug in PHP. The error
'Fatal error: Uncaught Error: Using $this when not in object context in'
appears in the function using $this
, but the error is that the calling function is using non-static function as a static. I.e:
Class_Name
{
function foo()
{
$this->do_something(); // The error appears there.
}
function do_something()
{
///
}
}
While the error is here:
Class_Name::foo();
When you call the function in a static context, $this
simply doesn't exist.
You would have to use this::xyz()
instead.
To find out what context you're in when a function can be called both statically and in an object instance, a good approach is outlined in this question: How to tell whether I’m static or an object?
You need to load your class replace :
foobar::foobarfunc();
by :
(new foobar())->foobarfunc();
or :
$Foobar = new foobar();
$Foobar->foobarfunc();
Or make static function to use foobar::
.
class foobar {
//...
static function foobarfunc() {
return $this->foo();
}
}
First you understand one thing, $this inside a class denotes the current object.
That is which is you are created out side of the class to call class function or variable.
So when you are calling your class function like foobar::foobarfunc(), object is not created. But inside that function you written return $this->foo(). Now here $this is nothing. Thats why its saying Using $this when not in object context in class.php
Solutions:
Create a object and call foobarfunc().
Call foo() using class name inside the foobarfunc().
You are calling a non-static method :
public function foobarfunc() {
return $this->foo();
}
Using a static-call :
foobar::foobarfunc();
When using a static-call, the function will be called (even if not declared as static
), but, as there is no instance of an object, there is no $this
.
So :
Here, the methods of your class are using the current instance of the class, as they need to access the $foo
property of the class.
This means your methods need an instance of the class -- which means they cannot be static.
This means you shouldn't use static calls : you should instanciate the class, and use the object to call the methods, like you did in your last portion of code :
$foobar = new foobar();
$foobar->foobarfunc();
For more informations, don't hesitate to read, in the PHP manual :
Also note that you probably don't need this line in your __construct
method :
global $foo;
Using the global
keyword will make the $foo
variable, declared outside of all functions and classes, visibile from inside that method... And you probably don't have such a $foo
variable.
To access the $foo
class-property, you only need to use $this->foo
, like you did.
Just use the Class method using this foobar->foobarfunc();
Source: Stackoverflow.com