No value is returned.
Example #1 مثال SplObjectStorage::detach()
<?php
$o = new StdClass;
$s = new SplObjectStorage();
$s->attach($o);
var_dump(count($s));
$s->detach($o);
var_dump(count($s));
?>
The above example will output something similar to:
int(1) int(0)