我有一个数组，如下所示。。。
array(2) {
["gender"]=>
array(2) {
[1]=>
string(4) "Male"
[2]=>
string(6) "Female"
}
["agegroup"]=>
array(3) {
[3]=>
string(7) "18 - 24"
[4]=>
string(7) "25 - 40"
[5]=>
string(7) "40 - 65"
}
}
这个数组是动态的。就像"性别"answers"年龄组"一样，可以有任意数量的项目。所有这些项都是子数组（关联的）。我想在php中写一个循环，它从第一个数组元素循环到下一个数组元素。
In the above example... the following output should come...
Male- 18-24
Male- 25-40
Male- 40-65
FeMale- 18-24
FeMale- 25-40
FeMale- 40-65
如果数组如下。。。
array(2) {
["location"]=>
array(2) {
[A]=>
string(4) "New York"
[B]=>
string(6) "London"
}
["gender"]=>
array(2) {
[1]=>
string(4) "Male"
[2]=>
string(6) "Female"
}
["agegroup"]=>
array(3) {
[3]=>
string(7) "18 - 24"
[4]=>
string(7) "25 - 40"
[5]=>
string(7) "40 - 65"
}
}
然后。。。输出应该是…
New York- Male- 18-24
New York- Male- 25-40
New York- Male- 40-65
New York- FeMale- 18-24
New York- FeMale- 25-40
New York- FeMale- 40-65
London- Male- 18-24
London- Male- 25-40
London- Male- 40-65
London- FeMale- 18-24
London- FeMale- 25-40
London- FeMale- 40-65
如果定义了数组长度，我将能够使用foreach()来编写代码段。但是父数组和子数组的数组长度都是动态的。。。有人能告诉我如何循环它以获得所需的输出吗？
function make ($arr, $pref = '') { // pref - saving path to this point
foreach (array_shift($arr) as $item) // take the 1st item of array and remove it
if($arr) make($arr,$pref . $item ." - "); // Call with sub-tree, add item to path
else echo $pref . $item ."'n"; // Empty array - we are at leaf
}
make($arr);
第二种情况的结果：
New York - Male - 18 - 24
New York - Male - 25 - 40
New York - Male - 40 - 65
New York - Female - 18 - 24
New York - Female - 25 - 40
New York - Female - 40 - 65
London - Male - 18 - 24
London - Male - 25 - 40
London - Male - 40 - 65
London - Female - 18 - 24
London - Female - 25 - 40
London - Female - 40 - 65