算上类似数组的键 [英] Count Similar Array Keys

问题描述

我有一个POST请求来我的页面之一，这里是一小部分：

I have a POST request coming to one of my pages, here is a small segment:

[shipCountry] => United States
[status] => Accepted
[sku1] => test
[product1] => Test Product
[quantity1] => 1
[price1] => 0.00

这请求可以是任何尺寸，并且每个产品的名称和数量的主要会遇到的productN和quantityN，其中N是一个整数，从1开始。

This request can be any size, and each products name and quantity's key would come across as "productN" and "quantityN", where N is an integer, starting from 1.

我想可以算很多独特的钥匙怎么格式符合以上，这会给我多少产品被勒令（未明确请求给予号）的计数。

I would like to be able to count how many unique keys match the format above, which would give me a count of how many products were ordered (a number which is not explicitly given in the request).

什么是在PHP中做到这一点的最好方法是什么？

What's the best way to do this in PHP?

推荐答案

好吧，如果你知道，每款产品都会有相应的数组键匹配productN，你可以这样做：

Well, if you know that every product will have a corresponding array key matching "productN", you could do this:

$productKeyCount = count(preg_grep("/^product(\d)+$/",array_keys($_POST)));

preg_grep（）在阵列非常适用于那种事。

preg_grep() works well on arrays for that kind of thing.

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