My mind is going? empty($_SESSION["not_there"])

[Bob Stearns]

I thought that the given expression was always TRUE if "not_there"
wasn't among the keys (or subscripts if you will) of $_SESSION.

Below find a dump of $_SESSION, a small snippet of code and the results.
I really don't understand. A new pair of eyes may be able to spot what
should be an obvious bug.

Thanks for looking.

_SESSION=array 16 { userid=>bob; setname=>Junk_C ows; setuser=>jhough ;
setid=>Junk_Cow s.jhough; locid=>11111111 1; maxloc=>1111111 11; empid=>1;
personal_id=>10 724; administrator=> ; locname=>Benysh ek-Hough; left=>1;
right=>1152; emp_left=>1; emp_right=>1152 ; uses_eid=>Y; bhid=>292550; }

$debug .= "<br>date 1=$date; <br>";
if(empty($date) ) {
$debug .= "<br>date 2=$date; <br>";
if(empty($_SESS ION["sale_date"])) {
$date = date("m-d-Y");
$debug .= "<br>date 3=$date; <br>";
}
else {
$date = $_SESSION["sale_date"];
$debug .= "<br>date 4=$date; <br>";
}
}
$_SESSION["sale_date"] = $date;
$debug .= "<br>date 5=$date; <br>";

date 1=;

date 2=;

date 4=2;

date 5=2;

[Jan Pieter Kunst]

In article <ep************ *****@fe02.lga> , Bob Stearns
<rs**********@c harter.net> wrote:

I thought that the given expression was always TRUE if "not_there"
wasn't among the keys (or subscripts if you will) of $_SESSION.

I would always use:

if (isset($_SESSIO N['not_there'])) {

}

or

if (array_key_exis ts('not_there', $_SESSION)) {

}

in your case.

Try if that works better. I only use empty($var) when I am certain that
$var exists. (Note: I didn't follow your code step by step, so this may
be useless advice.)

JP

[Justin Koivisto]

Bob Stearns wrote:

I thought that the given expression was always TRUE if "not_there"
wasn't among the keys (or subscripts if you will) of $_SESSION.

Below find a dump of $_SESSION, a small snippet of code and the results.
I really don't understand. A new pair of eyes may be able to spot what
should be an obvious bug.

For me, all the following give the same results: bool(true)

<?php
$ar=array('this '=>3);
var_dump(empty( $ar['that']));

$ar=array('this '=>'');
var_dump(empty( $ar['this']));

$ar=array('this '=>array());
var_dump(empty( $ar['this']));

$ar=array('this '=>NULL);
var_dump(empty( $ar['this']));

$ar=array('this '=>0);
var_dump(empty( $ar['this']));

$ar=array('this '=>'0');
var_dump(empty( $ar['this']));

$ar=array('this '=>FALSE);
var_dump(empty( $ar['this']));
?>

However, I never use empty($var) alone, I usually use variations like:
(!isset($var) || empty($var)) // not set or empty
(isset($var) && empty($var)) // set & empty
(isset($var) && !empty($var)) // set & not empty

--
Justin Koivisto, ZCE - ju****@koivi.co m
http://koivi.com