though the manual is perfectly clear that this should be expected, i was a
bit surprised that the result of the following is 42
<?php
function foo(&$a) {
$a = 42;
unset($a);
$a = 'meaning';
}
foo($a);
print("$a\n");
?>
normally i would expect unset() to free some memory. but in this example it
doesn't and has a different behavior: it releases foo's reference to the
global $a, allowing the next line to define a local $a.
i think i'd have preferred compile error.
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