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Update docs for Hash::apply()

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mark_story 2012-12-16 23:03:43 -05:00
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lib/Cake/Utility/Hash.php
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@ -698,6 +698,17 @@ class Hash {
* Apply a callback to a set of extracted values using `$function`. * Apply a callback to a set of extracted values using `$function`.
* The function will get the extracted values as the first argument. * The function will get the extracted values as the first argument.
* *
* ### Example
*
* You can easily count the results of an extract using apply().
* For example to count the comments on an Article:
*
* `$count = Hash::apply($data, 'Article.Comment.{n}', 'count');`
*
* You could also use a function like `array_sum` to sum the results.
*
* `$total = Hash::apply($data, '{n}.Item.price', 'array_sum');`
*
* @param array $data The data to reduce. * @param array $data The data to reduce.
* @param string $path The path to extract from $data. * @param string $path The path to extract from $data.
* @return mixed The results of the applied method. * @return mixed The results of the applied method.