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Going through the entire $ _SESSION array and removing the null variables

I did some tests with $ _SESSION variables, and many of them were set to NULL, but still exist. I can delete them one by one, but how can I just skip the $ _SESSION array and quickly remove the NULL variables?

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7 answers

This will remove the values NULL, but not others empty or FALSE. Easily modified if you also want to get rid of FALSEvals and empty lines, etc.

foreach ($_SESSION as $key=>$var)
{
  if ($var === NULL) unset($_SESSION[$key]);
}
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You can use array_filterwith a callback function that uses is_null:

$output = array_filter($input, function($val) { return !is_null($val); });
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$_SESSION = array_filter($_SESSION, 'count');

NULL ( count() 0 NULL), ( ), 0 , PHP:

var, , .

var , 1 . , var NULL, 0 .

0 false , - .

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$_SESSION = array_filter($_SESSION);

"" , null.

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:

foreach ($_SESSION as $key => $value)
{
    if ($value === NULL)
        unset($_SESSION[$key];
}

P.S. array_filter - "false". , NULL- .

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foreach($_SESSION as $key => $value){
   if(empty($value) || is_null($value)){
       unset($_SESSION[$key]);
   }
}
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If you “delete” $_SESSIONitems by setting the value to NULL, you are doing it wrong. To disable an array element, you must use unset on the element $_SESSION.

# Wrong
$_SESSION['foo'] = NULL;

#Good
unset($_SESSION['foo']);
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