Not able to set value to false

Question

1.00/5 (1 vote)

See more:

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

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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!