HTML Checkbox To PHP Array

3rd April 2008 - 3 minutes read time

To create a simple HTML check box use the following bit of code.

<input type="checkbox" name="option2" value="Milk" />

To set the checkbox as filled in include a checked attribute. To make the control XHTML compliant you will need to do the following.

<input type="checkbox" name="option2" value="Milk" checked="checked" />

When the form is posted this value is sent to PHP with the $_POST superglobal array.

To link several checkboxes together to make them into an array in the PHP $_POST array you need to make all of the checkboxes have the same name, and each name must end in "[]".

<input type="checkbox" name="option[]" value="1" />
<input type="checkbox" name="option[]" value="2" />

When both of the checkboxes are filled and the form is submitted this produces the following array.

Array
(
 [option] => Array
 (
  [0] => 1
  [1] => 2
 )
 
 [submit] => Submit Query
)

To set values in the array you can include a string in between the [] in the checkbox name.

<input type="checkbox" name="option[43]" value="1" />
<input type="checkbox" name="option[23]" value="2" />

This produces the array.

Array
(
 [option] => Array
 (
  [43] => 1
  [23] => 2
 )
 
 [submit] => Submit Query
)

 

PHP

Add new comment

The content of this field is kept private and will not be shown publicly.
CAPTCHA
7 + 13 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Related Content

Drawing A Parabolic Curve With Straight Lines In PHP

12th May 2024

A parabolic curve is a type of curve where every point is an equal distance from a focal point. There a number of different way to generate this sort of curve using math, but one of the simplest is to use straight lines to create the illusion of the curve.

Read more

Recreating Spotify Wrapped In PHP

17th March 2024

I quite like the end of the year report from Spotify that they call "Wrapped". This is a little application in which they tell you what your favorite artist was and what sort of genres you listened to the most during the year.

Read more

Should A Constructor Throw An Exception?

18th February 2024

Let's say you had a class that you wanted to use, but there was some sort of error in creating the object. This might be that the wrong parameters were passed, or the third party service (eg. a database) wasn't available at the time of creation.

Read more

PHP Question: Variable Reference

10th December 2023

Question

What does the following code print out?

function arrayPrint($array)
{
   echo implode(' ', $array);
}

$arrayA = [1, 2, 3];
$arrayB = $arrayA;
$arrayB[1] = 0;
arrayPrint($arrayA);

Read more

Creating An Authentication System With PHP and MariaDB

15th October 2023

Using frameworks to handle the authentication of your PHP application is perfectly fine to do, and normally encouraged. They abstract away all of the complexity of managing users and sessions that need to work in order to allow your application to function.

Read more

Creating Sparklines In PHP

17th September 2023

A sparkline is a very small line graph that is intended to convey some simple information, usually in terms of a numeric value over time. They tend to lack axes or other labels and are added to information readouts in order to expand on numbers in order to give them more context.

Read more