Description:
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<pre> 
file NumericVarName.php
<?php 
$TestVar = 8888; 
$$TestVar = 'See the KEY\'s type...'; 
$SeeThis = get_defined_vars();
function MyEcho($_Msg) {echo '<script>alert(\'' . $_Msg . '\');</script>';}

isset($$TestVar) && MyEcho('Case A!');
isset($SeeThis[8888]) && MyEcho('Case B!');
isset($SeeThis['8888']) && MyEcho('Case C!');

foreach ($SeeThis as $_Ui => $_Uk) { 
    ($_Ui === 8888) && $_Temp = 'Case B too!'; 
    ($_Ui === '8888') && $_Temp = 'Case C too!'; 
    isset($_Temp) && MyEcho($_Temp); 
}
?>
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My English is poor.Just explain my question shortly:
The output contains "Case A!" & "Case C too!",
but why not contain "Case C!" before "Case C too!" ?
------------------------------------------------------------------------------
Hope you can analyse what I've talk about,
maybe something not expect comes such as:
- syntax-parser do not check "$$var" when "$var" is numeric.
- do "foreach array" with get_defined_vars()'s return has a shortcoming.
- ...
Wish PHP better & better...
</pre>