将数组计数值的结果排序到一个新数组中

Question

我想将结果排序到一个新数组但没有 $key 所以最不唯一的数字将排在第一位（或重复次数最多的数字将排在第一位）。

<?php

$a = array (1,1,2,2,2,3,3,3,3,4,4,4,4,4,5);

foreach (array_count_values($a) as $key => $value) {
        echo $key.' - '.$value.'<br>'; 
}

//I am expecting to get the most duplicated number FIRST (without the $key)
//so in that case :
// $newarray = array(4,3,2,1,5); 
?>

Answer 1

$a = array (1,1,2,2,2,3,3,3,3,4,4,4,4,4,5);

$totals = array_count_values($a);

arsort( $totals );

echo "<pre>";
print_r($totals);

输出

Array
(
    [4] => 5
    [3] => 4
    [2] => 3
    [1] => 2
    [5] => 1
)

Answer 2

这样做

<?php
$a = array (1,1,2,2,2,3,3,3,3,4,4,4,4,4,5,6,7,8,9);
$n=array_count_values($a);
arsort($n);
print_r(array_keys($n));

Demo

输出：

   Array
(
    [0] => 4
    [1] => 3
    [2] => 2
    [3] => 1
    [4] => 9
    [5] => 8
    [6] => 5
    [7] => 6
    [8] => 7
)

Answer 3

$newarray = array_keys(array_count_values($a));