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Bug #20780 switch ... case ... statement cannot distinguish a string with integer 0
Submitted: 2002-12-02 23:54 UTC Modified: 2002-12-03 20:39 UTC
From: rosewell at cnk dot com dot cn Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4.2.3 OS: Windows 2000
Private report: No CVE-ID: None
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From: rosewell at cnk dot com dot cn
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 [2002-12-02 23:54 UTC] rosewell at cnk dot com dot cn 
<?php

$a = 'center';
switch ($a) {
    case 'left':
    case 0: echo 'left';break;
    case 'right':
    case 2: echo 'right';break;
    default:echo 'center';
}

?>

The script should generate 'center',yet generate 'left';what's more,any string assigned to variable $a will generate the same error. The reason is the PHP scripting engine cannot distinguish a string with integer 0. I wonder if the switch statement can only be applied on integers.

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 [2002-12-03 01:16 UTC] chregu@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

See

http://ch.php.net/manual/en/language.types.string.php#language.types.string.conversion
 [2002-12-03 20:39 UTC] rosewell at cnk dot com dot cn 
Thanks a lot for your tip. And now I've seen what a silly mistake I'd made. And I felt deeply sorry for disturbing you with such a silly fault.

But I wonder if PHP can introduce a Not_a_Number value just like the NaN in JavaScript. For PHP and JavaScript are both loose-type language, i.e. scripting language. For some convention, I think, it is unusual to automatically convert a string (especially a NOT_A_NUMBER string) to an integer, in which most case is converted to 0 and is not intuitionistic. And I find many people before have complained about it. So I'll be glad that you'll consider it.

Thank you again for your serious consideration.
 
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