我正在尝试确定多维关联数组中每个数组的计数。例如，如果我有一个像：
这样的数组Array
(
[food] => Array
(
[soup] => Array
(
[chicken noodle] =>
[tomato] =>
[french onion] =>
)
[salad] => Array
(
[house] =>
[ceasar] =>
)
)
[drink] => Array
(
[soda] => Array
(
[coke] =>
[sprite] =>
[dr pepper] =>
)
[alcoholic] => Array
(
[whiskey] => Array
(
[Jim Beam] =>
[Jameson] =>
[Bushmills] =>
)
[vodka] => Array
(
[Stolichnaya] =>
[Ketel One] =>
[Grey Goose] =>
[Belvedere] =>
)
[rum] => Array
(
[Captain Morgan] =>
[Bacardi] =>
)
)
)
)
不太清楚如何解释这个，所以我会尽我所能。我想找出数组中每个数组的计数。因此，我希望从这个数组中得到的值看起来像：
Array
(
// total count of all arrays at "level 1" (i.e. food & drink)
[0] => 2
// total count of all arrays at "level 2" (i.e. soup, salad, soda, alcoholic)
[1] => 4
// total count of all arrays at "level 3" (i.e. chicken noodle, tomato, french onion, house, ceasar, coke, sprite, dr pepper, whiskey, vodka, rum)
[2] => 11
// total count of all arrays at "level 4" (i.e. Jim Beam, Jameson, Bushmills, Stolichnaya, Ketel One, Grey Goose, Belvedere, Captain Morgan, Bacardi)
[3] => 9
)
现在我知道我只使用值的索引键而不是值，而如果数组是标准的索引数组，那么获取这些值会更容易（我想我是在这里使用正确的术语，随意纠正我 - 当然，我要理解这一点 - 不是因为某人只是“给我一个答案”:)）因为我可以在{{{ 1}}循环并相应地增加我的计数。我已经搜索了SO这样的问题，但是没有找到它，如果我错过了它虽然可以随意简单地指出它。谢谢！
解决方案！（阅读会话流程的评论）
for($i = 0 $i < count($array); $i++)答案 0 :(得分：1)
更新＃2。很多信息，如果我失去你，请告诉我。
我在最后一段代码中犯了一些小错误（需要通过$current + 1代替$current++，而$levels[$current]++位于错误的位置）。我用你的示例数据测试了这个更新;它会对你有用。基本上，calc()是一个递归函数，它遍历数组的每个级别，计算作为数组的每个索引，并将该计数添加到主“计数”数组（$levels）。你可以坚持到你的课堂，正如我在下面所做的那样。
它不会故意返回任何内容。 $levels为passed by reference，每个级别的计数都会直接更新。因此，传递给calc()的第一个变量将变为数组，就像您在问题中寻找的那样。
如果您的类脚本看起来与此类似，那么应该收到错误。在class someName {之后，您应该只定义函数和变量。实际执行操作的代码（例如使用echo或设置$test = new Test();）需要在类定义之后放置。
话虽如此，如果你想在每次启动这个类时执行一些代码，你应该将这段代码放在类constructor中。
以下是我认为你希望你的班级看起来像。如果您希望$ data在类中，请使用var $data声明变量并将其填充到构造函数中。如果您感到困惑，请告诉我，我可以再次更新我的答案。
// Your class
class Test
{
// Counts the number of arrays in each level of $data
function calc(&$levels, $current, $parent)
{
if (!isset($levels[$current])) {
$levels[$current] = 0;
}
foreach($parent as $child) {
$levels[$current]++;
if (is_array($child)) {
$this->calc($levels, $current + 1, $child);
}
}
}
}
// Let's use the class! Create an instance of it
$test = new Test();
// Fill the data array
$data = array();
$data['food']['soup']['chicken_noodle'] = '';
$data['food']['soup']['tomato'] = '';
$data['food']['soup']['french onion'] = '';
$data['food']['salad']['house'] = '';
$data['food']['salad']['ceasar'] = '';
$data['drink']['soda']['coke'] = '';
$data['drink']['soda']['sprite'] = '';
$data['drink']['soda']['dr pepper'] = '';
$data['drink']['alcoholic']['whiskey']['Jim Beam'] = '';
$data['drink']['alcoholic']['whiskey']['Jameson'] = '';
$data['drink']['alcoholic']['whiskey']['Bushmills'] = '';
$data['drink']['alcoholic']['vodka']['Stolichnaya'] = '';
$data['drink']['alcoholic']['vodka']['Ketel One'] = '';
$data['drink']['alcoholic']['vodka']['Grey Goose'] = '';
$data['drink']['alcoholic']['vodka']['Belvedere'] = '';
$data['drink']['alcoholic']['rum']['Captain Morgan'] = '';
$data['drink']['alcoholic']['rum']['Bacardi'] = '';
// Count the data for arrays on each level
$count = array();
$test->calc($count, 0, $data);
// Print the results
echo '<pre>';
print_r($count);
exit ('</pre>');
答案 1 :(得分：0)