new classname is it and object ?
assing the new object to a variable $a.
$a is a variable but what is it ->attribute

class classname{
    public $attribute;

}
$a = new classname();
$a->attribute = "value";
echo $a->attribute;

bertrc new classname is it and object ?

Technically, you have created an instance of a class. Yes it is an object, with properties (class variables) and methods (class functions).

In the class definition, $attribute is the name of a (public) property (class variable.) You are setting the property (class variable) using $a->attribute = "value"; and you are referencing the property (class variable) using echo $a->attribute;

    This might make it a bit more obvious (or not?)

    class classname{
    public $message = 'Hello, World!';
    private $nope = "Can't touch this";
}

$foo = new classname();
echo $foo->message . "\n";
$foo->message = 'Goodbye, cruel world.';
echo $foo->message . "\n";
echo $foo->nope;

    Result:

    Hello, World!
Goodbye, cruel world.
PHP Warning:  Uncaught Error: Cannot access private property classname::$nope . . .

      For the official documentation on this, Classes and Objects. classname is the name of a class, attribute is a property belonging to the class. $a is an object that is an instance of classname. You then set its attribute property to have the value "value". And, for the record, marking the property public makes it visible outside the class so that you can set and read its value.

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