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Re: Switch question [message #184628 is a reply to message #184627]

Mon, 13 January 2014 11:53

Norman Peelman
Messages: 126
Registered: September 2010

Karma:

Senior Member

On 01/12/2014 11:10 PM, Norman Peelman wrote:
> On 01/12/2014 11:01 PM, Norman Peelman wrote:
>> On 01/12/2014 04:07 PM, Norman Peelman wrote:
>>> On 01/12/2014 12:26 PM, richard wrote:
>>>> On Sun, 12 Jan 2014 17:18:59 +0000 (UTC), Denis McMahon wrote:
>>>>
>>>> > On Sun, 12 Jan 2014 11:48:48 -0500, richard wrote:
>>>> >
>>>> >> The manual for PHP switch shows no examples on how to use multiple
>>>> >> values for the same case.
>>>> >> In liberty basic I would use the following:
>>>> >> case 1,2,3,4 case "A","B","C"
>>>> >>
>>>> >> What is the equivelant in PHP?
>>>> >>
>>>
>>> PHP does not support that method directly as you have discovered.
>>>
>>>> >> I use the following code to acquire a value:
>>>> >> $value=$_GET['v'];
>>>> >> switch ($value){
>>>> >> case "A";
>>>> >
>>>
>>> Under normal circumstances we know that $value is a string, therefor
>>> what is actually in $value is the question. If the code for *case "A"*
>>> is not being executed then $value <> A.
>>>
>>>> > This is f'd up, despite what you may believe ":" is not the same as
>>>> > ";"
>>>> >
>>>> >> echo "Does Not Work!";
>>>> >> case A:
>>>> >> echo "Does Not Work!";
>>>> >> }
>>>> >>
>>>> >> So what is the proper way to ensure the proper case is found
>>>> >> correctly?
>>>> >
>>>
>>> The example above would indicate that there is a CONSTANT A that
>>> $value is compared against. You are mixing problems.
>>>
>>>
>>>> > You seem to have missed the paragraph beginning "It is important to
>>>> > understand how the switch statement is executed in order to avoid
>>>> > mistakes." on the manual page. This paragraph answers your question.
>>>>
>>>> for once I get to say, to you, >>>> RTFM!
>>>> : is used for constants.
>>>> ; is used for strings.
>>>>
>>>
>>> Not true, the online manual simply indicates that a ; may be used
>>> instead of a : period. Don't know why, I'd never do it that way - seems
>>> to add confusion.
>>>
>>>> As usuaul, I find the answer to my question.
>>>> Instead of commas, use ||.
>>>>
>>>> case 1 || 2 || 3:
>>>> case "A" || "B" || "C";
>>>>
>>>> The syntax is correct!
>>>>
>>>
>>> There is nothing wrong with that syntax. It is merely an expression
>>> that ends up being true or not. Using : or ; for either case works as
>>> tested.
>>>
>>>
>>
>> Doh! scratch that... doesn't work.
>>
>
> And yes I know why. :) It returns a boolean value. 0 does not match
> but 4 does, "D" also matches. Ha, good catch Denis and Doug!
>

I should state that because *1 || 2 || 3* and *"A" || "B" || "C"*
will return a boolean (TRUE) value that:

0 (FALSE) fails to match as expected, any other number is considered TRUE.
"" and "0" (FALSE) fails to match as expected, any other non-empty
string is considered TRUE.

In reality the CASE expression hasn't been matched at all - not even
when $value contains 1,2 or 3 or "A","B" or "C". Only the boolean state
of TRUE or FALSE has been compared.

Richard, you will need to use the standard SWITCH...CASE syntax. I
overlooked that simple concept even as I typed it in my response.

--
Norman
Registered Linux user #461062
-Have you been to www.php.net yet?-

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[Message index]

		Switch question By: Mr Oldies on Sun, 12 January 2014 16:48
		Re: Switch question By: Denis McMahon on Sun, 12 January 2014 17:18
		Re: Switch question By: Mr Oldies on Sun, 12 January 2014 17:26
		Re: Switch question By: Luuk on Sun, 12 January 2014 17:44
		Re: Switch question By: Evan Platt on Sun, 12 January 2014 18:47
		Re: Switch question By: Denis McMahon on Sun, 12 January 2014 23:15
		Re: Switch question By: Norman Peelman on Sun, 12 January 2014 21:07
		Re: Switch question By: Norman Peelman on Mon, 13 January 2014 04:01
		Re: Switch question By: Norman Peelman on Mon, 13 January 2014 04:10
		Re: Switch question By: Norman Peelman on Mon, 13 January 2014 11:53
		Re: Switch question By: Denis McMahon on Mon, 13 January 2014 13:11
		Re: Switch question By: Denis McMahon on Sun, 12 January 2014 23:14
		Re: Switch question By: Doug Miller on Mon, 13 January 2014 01:40
		Re: Switch question By: The Natural Philosoph on Mon, 13 January 2014 01:54
		Re: Switch question By: Doug Miller on Mon, 13 January 2014 03:19
		Re: Switch question By: Arno Welzel on Mon, 13 January 2014 14:34
		Re: Switch question By: Denis McMahon on Sun, 12 January 2014 17:22
		Re: Switch question By: Thomas 'PointedEars' on Sun, 12 January 2014 22:36
		Re: Switch question By: Luuk on Sun, 12 January 2014 17:21
		Re: Switch question By: Beauregard T. Shagnas on Sun, 12 January 2014 17:34
		Re: Switch question By: Arno Welzel on Mon, 13 January 2014 14:32

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