PHP-计算二维数组中的重复值，然后仅显示具有计数的唯一值 [英] PHP - Count duplicate values within two dimensional array, then display only unique values with the count

问题描述

我已经为此工作了几天，但仍然没有达到我想要的结果.在此方面的任何帮助将不胜感激……谢谢您.

我有一个存储在$ log中的多数组，当您使用print_r($ log)时，它会显示如下:

   Array ( [0] => Array ( [0] => Red [1] => Steel ) 
           [1] => Array ( [0] => Red [1] => Wood ) 
           [2] => Array ( [0] => Blue [1] => Wood ) 
         )

目前我有这个:

$counts = $log;
foreach ($log as $value) {
    foreach ($value as $k  => $v) {
        if (!isset($counts[$k])) $counts[$k] = array();
        if (!isset($counts[$k][$v])) $counts[$k][$v] = 0;
        $counts[$k][$v] += 1;
    }
}

foreach ($counts as $k => $v1) {
    foreach ($v1 as $v => $count) {
        echo "$v => $count <br />";
    }
}

哪个显示:

0 => Red 
1 => Steel 
Red => 2 
Blue => 1 
0 => Red 
1 => Wood 
Steel => 1 
Wood => 2 
0 => Blue 
1 => Wood  

但是我真的希望最终结果是

<h2>Colors</h2>
Red => 2
Blue => 1

<h2>Materials</h2>
Steel => 1
Wood => 2

解决方案

如果使用的是PHP >= 5.5，则可以使用> 查看演示

---

或者，如果您不使用PHP >= 5.5，则可以在PHP 4, 5中使用:

$colors = $materials = array();
foreach ($log as $a){
    $colors[] = $a[0];
    $materials[] = $a[1];
}

$colors = array_count_values($colors);
$materials = array_count_values($materials);

> 请参见演示2

---

单击此处以获取适用于这两种方法的示例用例.

I've been working on this for a couple days now... and still haven't been able to achieve my desired results. Any help would on this would be greatly appreciated... thank you in advance.

I have a multi-array stored in $log, which displays like this when you print_r($log):

   Array ( [0] => Array ( [0] => Red [1] => Steel ) 
           [1] => Array ( [0] => Red [1] => Wood ) 
           [2] => Array ( [0] => Blue [1] => Wood ) 
         )

Currently I have this:

$counts = $log;
foreach ($log as $value) {
    foreach ($value as $k  => $v) {
        if (!isset($counts[$k])) $counts[$k] = array();
        if (!isset($counts[$k][$v])) $counts[$k][$v] = 0;
        $counts[$k][$v] += 1;
    }
}

foreach ($counts as $k => $v1) {
    foreach ($v1 as $v => $count) {
        echo "$v => $count <br />";
    }
}

Which Displays:

0 => Red 
1 => Steel 
Red => 2 
Blue => 1 
0 => Red 
1 => Wood 
Steel => 1 
Wood => 2 
0 => Blue 
1 => Wood  

But I'm really looking to have an end result of:

<h2>Colors</h2>
Red => 2
Blue => 1

<h2>Materials</h2>
Steel => 1
Wood => 2

解决方案

If you are using PHP >= 5.5, you can use array_column(), in conjunction with array_count_values():

$colors = array_count_values(array_column($log, 0));
$materials = array_count_values(array_column($log, 1));

See demo

---

Or, if you're not using PHP >= 5.5, this will work in PHP 4, 5:

$colors = $materials = array();
foreach ($log as $a){
    $colors[] = $a[0];
    $materials[] = $a[1];
}

$colors = array_count_values($colors);
$materials = array_count_values($materials);

See demo 2

---

Click here for sample use case that will work with either method.

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