我有一个从表中随机抽取5行的页面。它看起来与下面的相似。
<table>
<tr>
<td><input type = 'radio' name='bills[1]' value = 'y'><label for='1'>Yes</label> </td>
<td><input type = 'radio' name='bills[1]' value = 'n'><label for='1'>No</label> </td>
</tr>
<tr>
<td><input type = 'radio' name='bills[8]' value = 'y'><label for='8'>Yes</label> </td>
<td><input type = 'radio' name='bills[8]' value = 'n'><label for='8'>No</label> </td>
</tr>
<tr>
<td><input type = 'radio' name='bills[2]' value = 'y'><label for='2'>Yes</label> </td>
<td><input type = 'radio' name='bills[2]' value = 'n'><label for='2'>No</label> </td>
</tr>
<tr>
<td><input type = 'radio' name='bills[6]' value = 'y'><label for='6'>Yes</label> </td>
<td><input type = 'radio' name='bills[6]' value = 'n'><label for='6'>No</label> </td>
</tr>
<tr>
<td><input type = 'radio' name='bills[3]' value = 'y'><label for='3'>Yes</label> </td>
<td><input type = 'radio' name='bills[3]' value = 'n'><label for='3'>No</label> </td>
</tr>
</table>
这会返回一个数组，如下所示，
Array
(
[bills] => Array
(
[6] => y
[2] => n
[5] => n
[1] => y
[8] => y
)
)
通过使用foreach($_POST['bills'] as $bill)语句，我可以循环遍历该数组，但如何获得id的值及其相应的答案？在上述情况下，为6、2、5、1、8。
在foreach构造中包含密钥，如下
foreach($_POST['bills'] as $bill=>$answer)
{
echo "The value of $bill is $answer'n"; $bill will be 6,2,5,1,8 and $answer will be y,n,n,y,y
}
输出：
The value of 6 is y
The value of 2 is n
....
您可以使用key（）：
<?php
$array = array(
"one" => 1,
"two" => 2,
"three" => 3,
"four" => 4
);
while($element = current($array)) {
echo key($array)."'n";
next($array);
}
?>
或
foreach($_POST['bills'] as $bill=>$answer)
{
echo "$bill and $answer'n";
}