| Re: Parameter passing question [message #173598 is a reply to message #173550] |
Wed, 20 April 2011 06:49   |
Chuck Lavin
Messages: 5
Registered: April 2011
Karma:
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Junior Member |
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Thanks!
"Denis McMahon" <denis(dot)m(dot)f(dot)mcmahon(at)gmail(dot)com> wrote in message
news:4dac8b47$0$23634$bed64819(at)gradwell(dot)net...
> On Mon, 18 Apr 2011 14:34:33 -0400, Chuck Lavin wrote:
>
>> "Chuck Lavin" <x(at)x(dot)x> wrote in message
>> news:Qk%qp(dot)16994$7N3(dot)5715(at)newsfe10(dot)iad...
>>> "Unrest" <unrest(at)nullvector(dot)org> wrote in message
>>> news:4dac7f92$0$68307$afc38c87(at)news5(dot)united-newsserver(dot)de...
>>>> Am Mon, 18 Apr 2011 17:42:31 +0000 schrieb Denis McMahon:
>>>> > <?php
>>>> > if (isset($_GET['x'])) {
>>>> > if ($_GET['x'] == null) {
>>>> > // it's null
>>>> > } else {
>>>> > // it has data
>>>> > }
>>>> > } else {
>>>> > // it's not defined
>>>> > }
>>>> > ?>
>>>> >
>>>> >
>>>> isset() checks if a variable exists and _is not null_. ->
>>>> http://de.php.net/manual/en/function.isset.php
>>>>
>>>> so your "if ($_GET['x'] == null)" will never evaluate to true.
>
>>> My point exactly. How can I tell if a URL does not reference a
>>> parameter at all?
>>>
>>> I need to move passed parameters into session variables:
>>>
>>> 1) If a parameter is passed with a value, set the session variable with
>>> that
>>> value;
>>>
>>> 2) If a parameter is passed with an empty value, get rid of that
>>> session variable;
>>>
>>> 3) If a parameter is not passed at all (not referenced in the URL),
>>> don't touch the session variable.
>
>> I have this IF statement:
>>
>> if (isset($_SESSION['COMPANY_CODE'])) {
>> $COMPANY_CODE = $_SESSION['COMPANY_CODE'];
>> } else {
>> $query = parse_str($_SERVER['QUERY_STRING']); $COMPANY_CODE = $app;
>> $_SESSION['COMPANY_CODE'] = $COMPANY_CODE;
>> }
>>
>> It currently does the reverse of what I need it to do. This block gives
>> precedence to the session variable. If the session variable exists, the
>> passed parameter is ignored.
>>
>> I need to give precedence to the passed parameter. If the parameter is
>> passed (either with a value or empty), I need to modify the session
>> variable accordingly. If the parameter is not passed, I want to leave
>> the session variable untouched.
>>
>> As I understand it, checking for isset($app) will not tell the
>> difference between http://www.somewhere.com/?app= and
>> http://www.somewhere.com .
>
> <?php
>
> // first set the value according to the session variable
> // if set, else to an empty string
>
> if (isset($_SESSION['COMPANY_CODE'])) {
> $COMPANY_CODE = $_SESSION['COMPANY_CODE'];
> } else {
> $COMPANY_CODE = "";
> }
>
> // now over-ride the previous value with the value from the
> // http get request if one is set
>
> if (isset($_GET['app'])) {
> if ($_GET['app'] === "") {
> // app was an empty string
> $COMPANY_CODE = "";
> } else {
> // app was non empty string
> $COMPANY_CODE = $_GET['app'];
> }
> } else {
> // app not defined in get
> // leave variable alone alone
> }
>
> // finally, update the session variable to the current value
>
> $_SESSION['COMPANY_CODE'] = $COMPANY_CODE;
>
> ?>
>
> Rgds
>
> Denis McMahon
>
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