一句话解决方案:

$option1ChkBox = array_key_exists('chkBoxName', $_POST) ? true : false;

I see this question is old and has so many answers, but I'll give my penny anyway. My vote is for the javascript solution on the form's 'submit' event, as some has pointed out. No doubling the inputs (especially if you have long names and attributes with php code mixed with html), no server side bother (that would require to know all field names and to check them down one by one), just fetch all the unchecked items, assign them a 0 value (or whatever you need to indicate a 'not checked' status) and then change their attribute 'checked' to true

    $('form').submit(function(e){
    var b = $("input:checkbox:not(:checked)");
    $(b).each(function () {
        $(this).val(0); //Set whatever value you need for 'not checked'
        $(this).attr("checked", true);
    });
    return true;
});

这样你会得到一个像这样的$_POST数组:

Array
(
            [field1] => 1
            [field2] => 0
)

你可以在表单的提交事件中执行一些Javascript。这就是你所能做的，没有办法让浏览器自己做这件事。这也意味着没有Javascript的用户将无法使用表单。 更好的方法是在服务器上知道有哪些复选框，这样就可以推断出那些从提交的表单值(PHP中的$_POST)中缺少的复选框是未选中的。

您可以在提交表单之前添加隐藏元素。

$('form').submit(function() {
  $(this).find('input[type=checkbox]').each(function (i, el) {
    if(!el.checked) {
      var hidden_el = $(el).clone();
      hidden_el[0].checked = true;
      hidden_el[0].value = '0';
      hidden_el[0].type = 'hidden'
      hidden_el.insertAfter($(el));
    }
  })
});

对于复选框，一个不使用隐藏类型值的简单方法是:

< >形式 <input type='checkbox' name='self - destruct' value='1'> > < /形式

在PHP中，对于表单数据的发布:

// Sanitize form POST data
$post = filter_var_array($_POST, FILTER_SANITIZE_STRING);

// set the default checkbox value
$selfDestruct = '0';
if(isset($post["selfdestruct"]))
    $selfDestruct = $post["selfdestruct"];

我先试了山姆的版本。 好主意，但它会导致表单中有多个具有相同名称的元素。如果您使用任何基于名称查找元素的javascript，它现在将返回一个元素数组。

我已经在PHP中解决了Shailesh的想法，它为我工作。 这是我的代码:

/* Delete '.hidden' fields if the original is present, use '.hidden' value if not. */
foreach ($_POST['frmmain'] as $field_name => $value)
{
    // Only look at elements ending with '.hidden'
    if ( !substr($field_name, -strlen('.hidden')) ) {
        break;
    }

    // get the name without '.hidden'
    $real_name = substr($key, strlen($field_name) - strlen('.hidden'));

    // Create a 'fake' original field with the value in '.hidden' if an original does not exist
    if ( !array_key_exists( $real_name, $POST_copy ) ) {
        $_POST[$real_name] = $value;
    }

    // Delete the '.hidden' element
    unset($_POST[$field_name]);
}