Form Validation : Checkbox input through PHP

Question

Hey I just wanted to know how do we check if a user has checked a checkbox or not in a form after hitting the submit buttom . I am using PHP so any help regarding that would be really appreciated . Thanks

Can you show us your effort? – Mohit Mehta Mar 20 '13 at 10:08 — Mohit Mehta, Mar 20 '13 at 10:08
can you post your checkbox code here? – Dead Man Mar 20 '13 at 10:08 — Dead Man, Mar 20 '13 at 10:08
do some basic search before asking to stack.. – Shiju Shaji Mar 20 '13 at 11:03 — Shiju Shaji, Mar 20 '13 at 11:03

score 5 · Accepted Answer · answered Mar 20 '13 at 10:09

5

You can do it like this:

if(isset($_POST['checkbox_name']) && $_POST['checkbox_name']!="")
{
    echo 'checkbox is checked'; 
}

answered Mar 20 '13 at 10:09

Dead Man

2,880
23
37

thanks I was using 'name' of the checkbox instead the 'value' . – Abhinav Mar 20 '13 at 10:11
Hey I have a little more doubt now , whats the difference between using a 'name' and 'value' in an input checkbox ? – Abhinav Mar 20 '13 at 10:13
`name` and `value` are totally different `attributes` of a checkbox. `name` is used to fetch the value of element, and `value` is the value of that element. – Dead Man Mar 20 '13 at 10:15

score 3 · Answer 2 · answered Mar 20 '13 at 10:10

3

<input type='checkbox' name='boxname' value='1' />

<?php
    if(isset($_POST['boxname'])
    {
        echo "check box is checked";
    }
?>

answered Mar 20 '13 at 10:10

Mohit Mehta

1,283
12
21

advermark · Answer 3 · 2013-03-20T10:14:28.713

1

HTML

<input type='checkbox' name='theName' value='itsChecked'>

PHP

if($_POST['theName'] == 'itsChecked'){}

edited Mar 20 '13 at 10:14

answered Mar 20 '13 at 10:08

advermark

231
1
10

3

Where's the `name` attribute? – asprin Mar 20 '13 at 10:09
Good point.. Input needs name='theName' & If statement will be $_POST['theName'] instead. – advermark Mar 20 '13 at 10:13
1

It's better to use `isset` first and then compare `==` to avoid warnings – asprin Mar 20 '13 at 10:15

Form Validation : Checkbox input through PHP

3 Answers3