具有相同名称属性的过帐表单字段 [英] POSTing Form Fields with same Name Attribute

问题描述

如果您有一个包含带有重复的name属性的文本输入的表单，并且该表单已过帐，您仍然能够从PHP的$_POST数组中获取所有字段的值吗?

If you have a form containing text inputs with duplicate name attributes, and the form is posted, will you still be able to obtain the values of all fields from the $_POST array in PHP?

推荐答案

否.仅最后一个输入元素可用.

No. Only the last input element will be available.

如果要使用相同名称的多个输入，请使用name="foo[]"作为输入名称属性. $_POST随后将包含foo的数组，其中包含来自输​​入元素的所有值.

If you want multiple inputs with the same name use name="foo[]" for the input name attribute. $_POST will then contain an array for foo with all values from the input elements.

<form method="post">
    <input name="a[]" value="foo"/>
    <input name="a[]" value="bar"/>
    <input name="a[]" value="baz"/>
    <input type="submit" />
</form>

请参阅站点上的HTML参考.

如果不使用[]，为什么$_POST仅包含最后一个值，是因为PHP基本上只会爆炸并遍历原始查询字符串以填充$_POST.当遇到已经存在的名称/值对时，它将覆盖前一个.

The reason why $_POST will only contain the last value if you don't use [] is because PHP will basically just explode and foreach over the raw query string to populate $_POST. When it encounters a name/value pair that already exists, it will overwrite the previous one.

但是，您仍然可以像这样访问原始查询字符串:

However, you can still access the raw query string like this:

$rawQueryString = file_get_contents('php://input'))

假设您具有这样的表单:

Assuming you have a form like this:

<form method="post">
    <input type="hidden" name="a" value="foo"/>
    <input type="hidden" name="a" value="bar"/>
    <input type="hidden" name="a" value="baz"/>
    <input type="submit" />
</form>

$ rawQueryString将包含a=foo&a=bar&a=baz.

然后，您可以使用自己的逻辑将其解析为数组.天真的方法是

You can then use your own logic to parse this into an array. A naive approach would be

$post = array();
foreach (explode('&', file_get_contents('php://input')) as $keyValuePair) {
    list($key, $value) = explode('=', $keyValuePair);
    $post[$key][] = $value;
}

这将为您提供查询字符串中每个名称的数组数组.

which would then give you an array of arrays for each name in the query string.

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