PHP胡子.隐式迭代器:如何获取当前值的键(数字php数组) [英] PHP Mustache. Implicit iterator: How to get key of current value(numeric php array)

问题描述

如果我有这样的php数组:

If I have php array like this:

 $a = array (
    99 => 'Something1',
    184 => 'Something2',
 );

并且键显示重要信息-它可以是一些常量值，例如ids

And keys present important information - It can be some constant values, ids e.t.c

然后如何从Templete获取当前元素的密钥. 例如:

Then how can I get key of current element from templete. For example:

{{#data}}

{.} - it is current value, but I need key also.

{{/data}}

在我们的系统中，这类数组太多了，因此以前很难重新解析它们.有什么更好的解决方案? 非常感谢你！

In our system too much these kind of arrays and it is uncomfortably re-parse them before. What's better solution for this? Thank you very much!

推荐答案

不可能在Mustache中的关联数组上进行迭代，因为Mustache将其视为哈希"而不是可迭代的列表.即使您可以遍历列表，也将无法访问密钥.

It is not possible to iterate over an associative array in Mustache, because Mustache sees it as a "hash" rather than an iterable list. And even if you could iterate over the list, you would not be able to access the keys.

为此，您必须准备数据.您可以在将数据传递到Mustache之前使用foreach循环来完成此操作，也可以通过将数组包装在"Presenter"中来进行操作.这样的事情应该可以解决问题:

In order to do this, you must prepare your data. You could do it with a foreach loop before you pass the data into Mustache, or you could do it by wrapping your array in a "Presenter". Something like this ought to do the trick:

<?php

class IteratorPresenter implements IteratorAggregate
{
    private $values;

    public function __construct($values)
    {
        if (!is_array($values) && !$values instanceof Traversable) {
            throw new InvalidArgumentException('IteratorPresenter requires an array or Traversable object');
        }

        $this->values = $values;
    }

    public function getIterator()
    {
        $values = array();
        foreach ($this->values as $key => $val) {
            $values[$key] = array(
                'key'   => $key,
                'value' => $val,
                'first' => false,
                'last'  => false,
            );
        }

        $keys = array_keys($values);

        if (!empty($keys)) {
            $values[reset($keys)]['first'] = true;
            $values[end($keys)]['last']    = true;
        }

        return new ArrayIterator($values);
    }
}

然后只需将您的数组包装在Presenter中:

Then simply wrap your array in the Presenter:

$view['data'] = new IteratorPresenter($view['data']);

您现在可以在遍历数据时访问键和值:

You now have access to the keys and values while iterating over your data:

{{# data }}
    {{ key }}: {{ value }}
{{/ data }}

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