问题描述
我注意到 PHP 似乎只返回选中复选框的值.我想查看复选框列表，而不仅仅是选中复选框的值.有没有办法检测未选中框的变量?
I noticed that PHP seems to return only values of checked checkboxes. I would like to see a list of checkboxes, not just values of checked checkboxes. Is there a way to detect variables of unchecked boxes?
我问是因为我希望能够更新设置.例如，我有一些已被选中的选项，但如果用户决定取消选中某个选项，我需要知道未选中的值，以便我可以更新要禁用的选项.
I asked because I want to be able to update settings. For example, I have a few options that are already checked but if an user decides to uncheck an option, I need to know that unchecked value so I can update the option to be disabled.
推荐答案
我自己刚刚遇到了这个问题.我通过添加具有相同名称的重复 hidden 字段来解决它.当浏览器发送此信息时，第二个字段会覆盖第一个字段(因此请确保 hidden 字段排在最前面).
I just ran into this problem myself. I solved it by adding a duplicate hidden field with the same name. When the browser sends this information, the second field overrides the first (so ensure that the hidden field comes first).
<input type="hidden" name="foo" value="">
<input type="checkbox" name="foo" value="bar">
如果 checkbox 没有被选中，你会得到:
If the checkbox is not checked you get:
$_REQUEST[ 'foo' ] == ""
如果checkbox被选中，你会得到:
If the checkbox is checked you get:
$_REQUEST[ 'foo' ] == "bar"
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