Description:
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http://www.php.net/manual/en/language.types.array.php#92186

This comment is invalid, I ran the test on PHP 4.4.9, 5.2.17 and 5.3.5

$a = array ('foo' => 1, 'bar' => 2, 'foo' => 3);
var_dump($a);

// Same output on all versions: array(2) { ["foo"]=> int(3) ["bar"]=> int(2) }