Associative array syntax question?

troels knak-nielsen wrote:

I just realised that his is valid PHP:

<?php
var_dump(
array(
'foo' => 42,
'foo' => 53));

Producing the following output:
array(1) {
["foo"]=>
int(53)
}

I can anticipate that there may be practical reasons for this
"feature", but I can't think up any scenario, where it wouldn't be a
programming error to statically declare an associative array with the
same key multiple times. Is this a bug or a known quirk? Should I file
a bug-report on it?

Expected behaviour.

--Jani