I have this code

if ( isset($_POST) ) {

}

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

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"

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"

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

Hey... Want to talk? Call me.... My telephone number >>>>

(+372) 56330687

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?