将对组合成组[PHP /数组] [英] Combine pairs to groups [PHP / Arrays]

问题描述

我在PHP数组中有成对的物品。示例：

I have pairs of items in an PHP array. Example:

<?php
$elements = array(
    'tiger'=>'lion',
    'car'=>'bike',
    'lion'=>'zoo',
    'truck'=>'plane'
);
?>

现在我想合并这些项目，以便所有以任何方式连接的项目都进入一个组。继续上面的示例：

Now I want to combine these items so that all items which are connected in any way go to one group. Continuation of the example above:

<?php
$groups = array(
    0=>array('tiger', 'lion', 'zoo'),
    1=>array('car', 'bike'),
    2=>array('truck', 'plane'
);
?>

这是可以理解的吗？我实现了吗？

Is this understandable? How could I achieve this?

我正在寻找一个可以做到这一点的函数。

I'm looking for a function which does this.

推荐答案

<?php

$elements = array(
    'tiger' => 'lion',
    'car' => 'bike',
    'lion' => 'zoo',
    'truck' => 'plane'
);

$groups = array();

foreach ($elements as $key => $val) {
    $appended = false;
    foreach ($groups as &$group) {
        if ($group[0] == $key) {
            array_unshift($group, $val);
            $appended = true;
            break;
        }
    }
    if (!$appended) {
        $groups[] = array($val, $key);
    }
}

var_dump($groups);

礼物：

array(3) {
  [0]=>
  array(3) {
    [0]=>
    string(3) "zoo"
    [1]=>
    string(4) "lion"
    [2]=>
    string(5) "tiger"
  }
  [1]=>
  &array(2) {
    [0]=>
    string(4) "bike"
    [1]=>
    string(3) "car"
  }
  [2]=>
  array(2) {
    [0]=>
    string(5) "plane"
    [1]=>
    string(5) "truck"
  }
}

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