php - Fatal error: Can't use function return value in write context in [filter_input] -


i'm learning php , have problem think filter_input function. 

<?php   if (!isset(filter_input(input_cookie, 'nazwa')) && !isset(filter_input(input_get, 'nazwa'))) {     include ("header.html");     include 'form.html';     include 'footer.html'; } else if (isset(filter_input(input_get, 'nazwa'))) {     setcookie("nazwa", (filter_input(input_get, 'nazwa')), time() + 60*60*24*365);     include 'header.html';     echo "<p> dziękujemy za podanie danych.</p>";     include 'footer.html'; } else {     include 'header.html';     echo "witamy, zostałeś rozpoznany jako {filter_input(input_cookie, 'nazwa')}.";     include 'footer.html'; }  ?>

i got:

fatal error: can't use function return value in write context in c:\users\user\documents\netbeansprojects\phpproject3\cookie\index.php on line 4

could plese me?

you using

isset(filter_input(input_get, 'nazwa')

instead, use (everywhere call isset()):

$func = filter_input(input_cookie, 'nazwa'); isset($func)

directly php documentation

warning isset() works variables passing else result in parse error. checking if constants set use defined() function.

isset() language construct. not normal function.


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