使用用户定义函数搜索 PHP 数组的优雅方式

Elegant way to search an PHP array using a user-defined function(使用用户定义函数搜索 PHP 数组的优雅方式)

问题描述

基本上，我希望能够获得 C++ 的 find_if()、Smalltalk 的 detect: 等的功能:

Basically, I want to be able to get the functionality of C++'s find_if(), Smalltalk's detect: etc.:

// would return the element or null
check_in_array($myArray, function($element) { return $elemnt->foo() > 10; });

但我不知道有任何 PHP 函数可以做到这一点.我想出的一个近似值":

But I don't know of any PHP function which does this. One "approximation" I came up with:

$check = array_filter($myArray, function($element) { ... });
if ($check) 
    //...

这样做的缺点是代码的目的不是很明确.此外，即使找到了元素，它也不会停止遍历数组，尽管这更像是一个挑剔(如果数据集大到足以引起问题，则无论如何线性搜索都不是答案)

The downside of this is that the code's purpose is not immediately clear. Also, it won't stop iterating over the array even if the element was found, although this is more of a nitpick (if the data set is large enough to cause problems, linear search won't be an answer anyway)

推荐答案

您可以编写自己的函数 ;)

You can write your own function ;)

function callback_search ($array, $callback) { // name may vary
    return array_filter($array, $callback);
}

这可能看起来没用，但它增加了语义并可以增加可读性

This maybe seems useless, but it increases semantics and can increase readability

这篇关于使用用户定义函数搜索 PHP 数组的优雅方式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！