Description:
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From manual page: http://php.net/manual/en/features.gc.refcounting-basics.php
---

I started reading the article at the page stated above and got confused by the sentence "The "refcount" gets decreased by one when any symbol linked to the variable container leaves the scope (e.g. when the function ends) or when unset() is called on a symbol.".

I believe there's at least one more way to reduce the refcount and that's by assignment.

I think that this missing information can confuse some people when they first read it. I think it should be stated that reducing the refcount can happen by making $a and/or $b reference to different zvals and possibly other ways that I couldn't come up with.

Test script:
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<?php
$a = "bla";
$b = $a;

// now $a and $b reference "bla"
xdebug_debug_zval('a');
xdebug_debug_zval('b');
$a = "this";

// show that the refcount decreases
xdebug_debug_zval('a');
xdebug_debug_zval('b');

$b = "some";

// now both $a and $b point to different zvals.
// the first "bla" zval must be food for the garbadge collector
xdebug_debug_zval('a');
xdebug_debug_zval('b');