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How to validate $_POST array

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  How to validate $_POST array Jakub <jak74@interia.pl> - 2022-08-11 11:47 +0200
    Re: How to validate $_POST array Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2022-08-11 14:43 +0000
      Re: How to validate $_POST array Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2022-08-11 14:49 +0000
    Re: How to validate $_POST array Arno Welzel <usenet@arnowelzel.de> - 2022-08-11 17:43 +0200
    Re: How to validate $_POST array "He, who travels time to time" <he1983912@aol.com> - 2022-09-22 07:12 -0700

#19068 — How to validate $_POST array

I have this code

if ( isset($_POST) ) {

}

how to do filter_has_var function to check if $_POST exist and have value?

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#19069

On Thu, 11 Aug 2022 11:47:02 +0200, Jakub wrote:

> I have this code
> 
> if ( isset($_POST) ) {
> 
> }
> 
> how to do filter_has_var function to check if $_POST exist and have value?

If the originating web page has issues a POST, then 
  $_SERVER['REQUEST_METHOD'] will equal 'POST'

Your php code can only extract from the POST values that were set by
the web page when it issued the POST. It can't demand a specific value,
but it can establish whether or not the page supplied a specific value.

Say, for instance, you expect that the page will supply a text string
in a variable called 'TextString', you can check to see if
$_POST['TextString'] is set, and validate it's contents.

So, your php logic might look like

  if ($_SERVER['REQUEST_METHOD'] == "POST")
  {
    if (isset($_POST['TextString']))
    {
      /* validate the contents of $_POST['TextString'] */
    }
    else
    {
      /* page didn't supply 'TextString'. Handle this situation */
    }
  }
  else
  {
    /* page didn't POST. Handle the situation. */
  }

HTH
-- 
Lew Pitcher
"In Skills, We Trust"

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#19070

On Thu, 11 Aug 2022 14:43:41 +0000, Lew Pitcher wrote:

> On Thu, 11 Aug 2022 11:47:02 +0200, Jakub wrote:
> 
>> I have this code
>> 
>> if ( isset($_POST) ) {
>> 
>> }
>> 
>> how to do filter_has_var function to check if $_POST exist and have value?
> 
> If the originating web page has issues a POST, then 
>   $_SERVER['REQUEST_METHOD'] will equal 'POST'
> 
> Your php code can only extract from the POST values that were set by
> the web page when it issued the POST. It can't demand a specific value,
> but it can establish whether or not the page supplied a specific value.
> 
> Say, for instance, you expect that the page will supply a text string
> in a variable called 'TextString', you can check to see if
> $_POST['TextString'] is set, and validate it's contents.
> 
> So, your php logic might look like
> 
>   if ($_SERVER['REQUEST_METHOD'] == "POST")
>   {
>     if (isset($_POST['TextString']))
>     {
>       /* validate the contents of $_POST['TextString'] */
>     }
>     else
>     {
>       /* page didn't supply 'TextString'. Handle this situation */
>     }
>   }
>   else
>   {
>     /* page didn't POST. Handle the situation. */
>   }

Note that $_POST is an array, so you /can/ iterate across the values in it

   if ($_SERVER['REQUEST_METHOD'] == "POST")
   {
      foreach ($_POST as $pKEY => $pVALU)
      {
        /*
        ** $pKEY is the subscript to $_POST,
        ** $pVALU is the value carried by $_POST[$pKEY]
        ** use $pKEY to choose your $pVALU validation criteria
        */
      }
   }
   else
   {
     /* page didn't POST. Handle the situation. */
   }





-- 
Lew Pitcher
"In Skills, We Trust"

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#19071

Jakub, 2022-08-11 11:47:

> I have this code
> 
> if ( isset($_POST) ) {
> 
> }
> 
> how to do filter_has_var function to check if $_POST exist and have value?

See <https://www.php.net/manual/en/function.filter-has-var.php>.



-- 
Arno Welzel
https://arnowelzel.de

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#19106

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Jakub kirjutas Neljapäev, 11. august 2022 kl 12:46:47 UTC+3:
> I have this code 
> 
> if ( isset($_POST) ) { 
> 
> } 
> 
> how to do filter_has_var function to check if $_POST exist and have value?

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