Using HTML Forms With PHP

By Nicholas Chase
2004-01-09

The Amazing Disappearing Checkboxes

It's important to realize that a checkbox is only submitted if it's actually checked. Otherwise, its very absence tells you what you need to know: the user didn't click this checkbox. In the case of checkboxes, you can check explicitly to see whether the value was set using the isset() function:

Listing 7. Checking to see if a checkbox was submitted

...

$contact_value = $HTTP_GET_VARS['contact']; 

echo $contact_value;



if (isset($contact_value)) {

  //The checkbox was clicked

} else {

  //The checkbox wasn't clicked

}

...

Tutorial pages:

Access Single and Multiple Form Values
The HTML Form
The Old Way: Accessing Global Variables
Accessing Form Value Collections
One Name, Multiple Values
The Amazing Disappearing Checkboxes
Getting All Form Values
One Final Note: Dots
Summary
Resources

First published by IBM developerWorks

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