Is it necessary to put space after $this keyword in OOP PHP according to PSRs?

Question

I studied PSR-2 and PSR-12 documentations completely but didn't find any explanation regarding whether to put any space after $this keyword.

My exact question is which one of following styles is more correct according to PSRs:

return $this->name;

or

return $this -> name;

sample codes to compare would be as below:

class Car
{
    public $name;
    public function getName()
    {
        return $this->name; // I've always seen this style (no spaces)
    }
}

in comparison with:

class Car
{
    public $name;
    public function getName()
    {
        return $this -> name; // Includes spaces
    }
}

Are both correct? If so, is there a reason to use one over the other?

Answer 1

There are no explicit rules for this in the standards mentioned, and no examples using $this in particular, but there are plenty of other examples of using the -> operator, and they consistently show it with no spaces around.

For instance, under "Method and Function Calls" (PSR-2 §4.6 / PSR-12 §4.7):

$foo->bar($arg1);

and

$foo->bar(
    $longArgument,
    $longerArgument,
    $muchLongerArgument
);

This doesn't mean that the standard requires that style, but it's a small piece of evidence that this is what most PHP developers would naturally expect.