Actually, it doesn't set to "blank", but to NULL... I bet you can guess
why! It doesn't exist (null). In Java, this would throw a "null pointer
exception" (on of the reasons I love PHP! Though, if you have
error-reporting set at the right level (Notice), PHP will throw an
"Undefined index..." notice.
This is an excellent example/reason to first check for existence before
assigning...
$numbers = array('a' => 1, 'b' => 2, 'c' => 3);
$a = $numbers['a'];
$a = $numbers['d'];
$a = (isset($numbers['d'])) ? $numbers['d'] : $a;
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