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Re: Simpler way to validate form fields?

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Am 05.12.2012 11:36, schrieb Gilles:
> On Wed, 05 Dec 2012 10:56:24 +0100, "M. Strobel"
> <sorry_no_mail_here@nowhere.dee> wrote:
>> Too basic. My user input reader is
>>
>> function getStringFromForm($key, $l=255, $val=null) {
>>    return (isset($_REQUEST[$key])) ?
>>          filter_var(substr($_REQUEST[$key],0,$l), FILTER_SANITIZE_STRING) :
>>          $val;
>> }
>>
> [...]
>> I read $_REQUEST, because the first thing my dispatcher does is a check for GET/POST,
>> and POST form values can be as easily manipulated as get values. So EVERY string
>> input uses this function.
> 
> Thanks much for the code. I'm not sure I understand what you mean
> about checking for GET/POST. Do you mean this?
> 
> ============
> if ($_SERVER['REQUEST_METHOD'] === 'POST') {
>     //Call getStringFromForm, getEmailFromForm, and getIntFromForm
> 	//for each form field
> }
> ============

One more observation to the default value val:

with getIntFromForm() the settable default is especially useful, because PHP likes to
return integer 0 for an empty input. Example:

php > echo 'simple conversion to integer: ', (int) '', PHP_EOL;
simple conversion to integer: 0
php >

With my function design you decide at call time which default value you want to have,
without cluttering your code with if branches.

/Str.

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Thread

Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-04 23:37 +0100
  Re: Simpler way to validate form fields? "Beauregard T. Shagnasty" <a.nony.mous@example.invalid> - 2012-12-04 23:44 +0000
    Re: Simpler way to validate form fields? Jerry Stuckle <jstucklex@attglobal.net> - 2012-12-04 19:04 -0500
  Re: Simpler way to validate form fields? Jerry Stuckle <jstucklex@attglobal.net> - 2012-12-04 19:07 -0500
    Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-05 11:32 +0100
    Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-05 12:49 +0100
  Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-05 10:56 +0100
    Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-05 11:36 +0100
      Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-05 11:52 +0100
      Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-05 12:09 +0100
        Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-06 14:43 +0100
          Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-06 14:55 +0100
            Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-06 17:50 +0100
              Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-06 17:51 +0100
            Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-06 17:50 +0100
              Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-06 17:55 +0100
                Re: Simpler way to validate form fields? Gilles <nospam@nospam.com> - 2012-12-07 11:15 +0100
                Re: Simpler way to validate form fields? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-12-07 11:56 +0100

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