[dcphp-dev] PHP self:: vs static::

In this code snippet, I get output that says "keykey"

What is the difference between the meanings of static:: and self:: in
this or any other context. Any man page reference would be gratefully
received!

<?php
error_reporting(E_ALL);

Class Thing
{
const PRIMARY_KEY = 'key';

public function keys()
{
$x = self::PRIMARY_KEY;
$y = static::PRIMARY_KEY;
return $x . $y;
}
}

$thing = new Thing;
var_dump($thing->keys());

Thanks and regards, Ray

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