php and checkboxes

[gusblake]

how does php check whether a checkbox has been ticked in a form? i thought of making a js function that wrote something into a hidden text box according to whether the checkbox was ticked or not, but is there a simpler way with php?

[mwinter]

how does php check whether a checkbox has been ticked in a form?

It doesn't, not directly anyway. The checked state of a checkbox determines if it is a successful control. Successful controls are submitted as part of the form data, whereas unsuccessful controls aren't submitted at all.

If the name of that control is part of the $_GET or $_POST superglobals (depending on the submission method), you know it was successful. If not, then the box was unchecked.

if(isset($_GET['control-name'])) {
  /* Checked */
}

Mike

[gusblake]

thanks!