Not able to set value to false

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Hi,

How can I set a value to false in PHP?

is_adoption is my value and it can be either true, false or null

I have no problem settings it to true usin adoption=1 in my URL

but when I set it to adoption=0 i expect it to be false but it's ending up with null in my database

What I have tried:

Here is what I am trying:

PHP

if (!is_null($_GET["adoption"]) && !empty($_GET["adoption"])) $adoption = $_GET["adoption"]; else $adoption = NULL;

Posted 11-Oct-19 13:13pm

Jassim Rahma

Updated 12-Oct-19 1:43am

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2 solutions

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Richard MacCutchan · Answer 1 · 2019-10-12T00:19:00

Solution 1

The following simple test shows that a value of zero is considered as empty:

PHP

$start = 0;
if (is_null($start)) print "null: " . $start;
if (empty($start)) print "empty: " . $start;

Posted 12-Oct-19 0:19am

Richard MacCutchan

Comments

Jassim Rahma 12-Oct-19 17:20pm

then what is the solution if I want empty is empty, zero is zero and one is one?

Richard MacCutchan 13-Oct-19 2:52am

There is no "solution", you need to redesign your code to take account of what a zero value indicates.

Luc Pattyn · Answer 2 · 2019-10-12T01:44:00

Solution 2

$adoption = NULL;
if (isset($_GET["adoption"])) $adoption = $_GET["adoption"];

:)

Posted 12-Oct-19 1:44am

Luc Pattyn

Comments

Jassim Rahma 12-Oct-19 17:20pm

Your solutions has the same problem

Luc Pattyn 12-Oct-19 17:37pm

My approach is correct.

I have the following page:

<html><head></head><body>
<?php
$arg = NULL;
if (isset($_GET["arg"])) $arg = $_GET["arg"];
if ($arg===null) echo "arg is absent";
else echo "arg=$arg";
echo "<br>";
if ($arg) echo "arg is non-zero (this will show only for non-null non-zero)";

?>
</body></html>

which you can try at https://www.lucpattyn.com/test1.php
and https://www.lucpattyn.com/test1.php?arg=0
and https://www.lucpattyn.com/test1.php?arg=1

It does what it must do. My guess is you are performing bad comparisons on your variable. Read the PHP doc on how null, numbers (zero and non-zero) and other data are converted into true/false!

Not able to set value to false

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Not able to set value to false

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