FieldtypeCheckbox

int — always 1 or 0.

// Get
$page->checkbox_field       // int: 1 or 0
(bool) $page->checkbox_field  // cast to bool if needed

// Set
$page->checkbox_field = 1;  // check it
$page->checkbox_field = 0;  // uncheck it
$page->checkbox_field = true;   // also valid — sanitized to 1
$page->checkbox_field = false;  // also valid — sanitized to 0
$page->save('checkbox_field');

// Find pages where checkbox is checked
$pages->find('checkbox_field=1');

// Find pages where checkbox is NOT checked
// Note: unchecked rows are not stored in the database, so this uses a LEFT JOIN
$pages->find('checkbox_field!=1');

// Equivalent to the above (unchecked = 0)
$pages->find('checkbox_field=0');

Note: Unchecked pages do not have a row in the field's database table. The !=1 selector handles this via a LEFT JOIN to correctly include pages that were never checked.

$page->renderValue('checkbox_field') renders differently depending on context:

• In the admin: renders a FontAwesome checkbox icon (fa-check-square-o or fa-square-o)
• Outside the admin: renders a disabled HTML <input type="checkbox">

In both cases a hidden <span> with a UTF-8 checkbox character (☒ or ☐) is included so the value survives tag-stripping.

Other common use cases:

if($page->checkbox_field) {
  echo "Yes";
} else {
  echo "No";
}

echo $page->checkbox_field ? 'Yes' : 'No';

echo $page->if('checkbox_field', 'Yes', 'No');

• The blank/default value is 0 (unchecked).
• Any truthy PHP value set on the field is sanitized to 1; any falsy value to 0.
• Compatible fieldtypes: FieldtypeCheckbox, FieldtypeToggle (if installed).
• Database column: tinyint NOT NULL, indexed.