How to get the value of a checkbox in PHP?

Hi
I am trying to create a, check-box for a user registration form.
When user fills all fields, he/she will be given a check box to confirm, that says " I agree with the terms and conditions, But, before registering, I need PHP to check the value whether the checkbox was submitted or not.

This is the HTML

<form method="POST" action="testing.php" >
I agree with the terms <input type="checkbox" name="chbox" value="1" /><br/>
<input type="submit" name="check" />

Code (markup):

And this is the PHP

<?php


if(isset($_POST['check'])){


$result = $_POST['chbox'];
echo $result;


}

Code (markup):

Now, this script will echo out, 1 if the checkbox is checked or Undefined index... if not.
I need to know, if I am doing something wrong, because I don't want the error to appear if the checkbox is not checked. I can suppress the error by adding, @ before the variable, but I don't think that is a good codding practice.

 

if (isset($_POST['check'])):

    if (isset($_POST['chbox'])):
        echo 'You need to select an option';
    else:
        $result = $_POST['chbox'];
        echo $result;
    endif;

endif;

PHP:

 

Thanks but if I click submit, while the checkbox is unchecked if gives me this error.

Notice: Undefined index: chbox in C:\xampp\htdocs\DIRECTORY\TESTING\testing.php on line -- Refering this this code

  $result = $_POST['chbox'];

Code (markup):

 

Because the code @ThePHPMaster gave you was wrong way round. You can either do !isset for the second if or change the statements.

 

<?php

if (isset($_POST['check'])) {

	$result = false;

	if (isset($_POST['chbox'])) {
		$result = $_POST['chbox'];
	}
				
	echo $result;
}

?>

Code (markup):

 

Thanks guys. Specially hassanahmad2

I twicked the code like this

 if (isset($_POST['check'])):

    if (!isset($_POST['chbox'])):
        echo '0';
    else:
        $result = $_POST['chbox'];
        echo $result;
    endif;


endif;


?> 

Code (markup):

Hope it is secure.

 

You are correct, it should be !isset and not isset. Good catch!

 

This is secure and I cut out what is not needed:

Note that empty() checks if it is set and that it is null.

 

Would not stay formatted when I used the php shortcodes so had to use quotes.