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
)

您不需要为所有复选框创建一个隐藏字段，只需复制我的代码。 它会改变复选框的值，如果不选中，值将赋值为0，如果选中复选框，则将值赋值为1

$("form").submit(function () {

    var this_master = $(this);

    this_master.find('input[type="checkbox"]').each( function () {
        var checkbox_this = $(this);


        if( checkbox_this.is(":checked") == true ) {
            checkbox_this.attr('value','1');
        } else {
            checkbox_this.prop('checked',true);
            //DONT' ITS JUST CHECK THE CHECKBOX TO SUBMIT FORM DATA    
            checkbox_this.attr('value','0');
        }
    })
})

我使用这个jQuery块，它将在提交时为每个未选中的复选框添加一个隐藏输入。它将保证您每次都为每个复选框提交一个值，而不会弄乱您的标记，并冒着忘记在稍后添加的复选框上执行此操作的风险。它也与您正在使用的任何后端堆栈(PHP、Ruby等)无关。

// Add an event listener on #form's submit action...
$("#form").submit(
    function() {

        // For each unchecked checkbox on the form...
        $(this).find($("input:checkbox:not(:checked)")).each(

            // Create a hidden field with the same name as the checkbox and a value of 0
            // You could just as easily use "off", "false", or whatever you want to get
            // when the checkbox is empty.
            function(index) {
                var input = $('<input />');
                input.attr('type', 'hidden');
                input.attr('name', $(this).attr("name")); // Same name as the checkbox
                input.attr('value', "0"); // or 'off', 'false', 'no', whatever

                // append it to the form the checkbox is in just as it's being submitted
                var form = $(this)[0].form;
                $(form).append(input);

            }   // end function inside each()
        );      // end each() argument list

        return true;    // Don't abort the form submit

    }   // end function inside submit()
);      // end submit() argument list

function SubmitCheckBox(obj) {
     obj.value   = obj.checked ? "on" : "off";
     obj.checked = true;
     return obj.form.submit();
}

<input type=checkbox name="foo" onChange="return SubmitCheckBox(this);">

我用JavaScript解决了这个问题:

<input type="hidden" name="checkboxName" value="0"><input type="checkbox" onclick="this.previousSibling.value=1-this.previousSibling.value">

注意在这两个输入元素之间不要有任何空格或换行符!

你可以使用this.previousSibling.previousSibling来获取“上层”元素。

使用PHP，您可以检查命名隐藏字段为0(未设置)或1(设置)。

到目前为止，我最喜欢的解决方案是放置一个与可能不被选中的复选框同名的隐藏输入。我认为它的工作原理是，如果复选框没有被选中，隐藏输入仍然是成功的，并发送到服务器，但如果复选框被选中，它将覆盖之前的隐藏输入。这样，您就不必跟踪已发布数据中的哪些值应该来自复选框。

<form>
  <input type='hidden' value='0' name='selfdestruct'>
  <input type='checkbox' value='1' name='selfdestruct'>
</form>