PHP对数组中的重复元素进行计数并结合ID

问题描述

我们如何找到多维数组中重复元素的数量以及ID的组合?

How can we find the count of duplicate elements in a multidimensional array and concat of ids ?

我有一系列具有Feed ID的技能名称.我需要计算技能名称和Feed ID的连续性.

I have an array of skill names with feed ids. I need to count skill name and concat of feed ids.

Array
(
    [0] => Array
        (
            [skill_name] => PHP
            [feed_id] => 100
        )
    [1] => Array
        (
            [skill_name] => CSS
            [feed_id] => 105
        )
    [2] => Array
        (
            [skill_name] => Php
            [feed_id] => 110
        )
    [3] => Array
        (
            [skill_name] => Php
            [feed_id] => 111
        )
    [4] => Array
        (
            [skill_name] => CSS
            [feed_id] => 112
        )
    [5] => Array
        (
            [skill_name] => Javascript
            [feed_id] =>114
        )
}

输出应如下所示.

Array
(
    [0] => Array
        (
            [skill_name] => PHP
            [feed_id] => 100, 110, 111
            [count]=>3
        )
    [1] => Array
        (
            [skill_name] => CSS
            [feed_id] => 105, 112
            [count]=>2
        )
    [2] => Array
        (
            [skill_name] => Javascript
            [feed_id] => 114
            [count]=>1
        )

}

提前谢谢！

推荐答案

//Assumption: Input is in $in

//Step 1: Cumulate
$tmp=array();
foreach ($in as $skill) {
  if (isset($tmp[$skill['skill_name']]))
    $tmp[$skill['skill_name']][]=$skill['feed_id'];
  else
    $tmp[$skill['skill_name']]=array($skill['feed_id']);
}

//Step 2: Fix up desired output format
$out=array();
foreach ($tmp as $k=>$v)
  $out[]=array(
    'skill_name' => $k,
    'feed_id' => implode(', ', $v),
    'count' => sizeof($v)
  );

//Result is in $out

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