[PHP-NOTES] note 130276 added to language.oop5.static

Although everyone will say you should not call a class static method from an instance of the class, if you do find occasion to be doing it, there are multiple syntaxes you can employ.

<?php
class Foo {

 public static method bar() {
  echo "OK\n";
 }
}

$myfoo = new Foo();
?>

1. Instance method syntax
<?php
$myfoo->bar(); //OK
?>
This is the worst option because it looks like you are calling an instance method.

2. Static method syntax
<?php
$myfoo::bar(); //OK
?>
This is most compact and its meaning is clear, although it might imply that $myfoo is a string containing the class's name.

3. Static method syntax with ::class (>=PHP8)
<?php
$myfoo::class::bar(); //OK
?>
Less compact but fully semantically sound. There is no known likelihood of the first two syntaxes going away, but the third should be 100% (or 99.9r%) future proof if you are paranoid.
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