PHP - Manual: array_count_values

2024-11-14

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array_count_values

(PHP 4, PHP 5, PHP 7, PHP 8)

array_count_values — 统计数组中所有的值

说明

array_count_values(array $array): array

array_count_values() 返回一个数组：数组的键是 array 里单元的值；数组的值是 array 单元的值出现的次数。

参数

array: 统计这个数组的值

返回值

返回一个关联数组，用 array 数组中的值作为键名，该值在数组中出现的次数作为值。

错误／异常

对数组里面的每个不是 string 或 int 类型的元素抛出一个警告错误（E_WARNING）。

范例

示例 #1 array_count_values() 例子


<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

以上例程会输出：

Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)

参见

count() - 统计数组、Countable 对象中所有元素的数量
array_unique() - 移除数组中重复的值
array_values() - 返回数组中所有的值
count_chars() - 返回字符串所用字符的信息

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User Contributed Notes 6 notes

down

sergolucky96 at gmail dot com ¶

4 years ago


Simple way to find number of items with specific values in multidimensional array:

<?php

$list = [
  ['id' => 1, 'userId' => 5],
  ['id' => 2, 'userId' => 5],
  ['id' => 3, 'userId' => 6],
];
$userId = 5;

echo array_count_values(array_column($list, 'userId'))[$userId]; // outputs: 2
?>

down

szczepan.krolgmail.c0m ¶

12 years ago


Here is a Version with one or more arrays, which have similar values in it:

Use $lower=true/false to ignore/set case Sensitiv.


<?php


$ar1[] = array("red","green","yellow","blue");

$ar1[] = array("green","yellow","brown","red","white","yellow");

$ar1[] = array("red","green","brown","blue","black","yellow");

#$ar1= array("red","green","brown","blue","black","red","green"); // Possible with one or multiple Array


$res = array_icount_values ($ar1);

print_r($res);


function array_icount_values($arr,$lower=true) {

     $arr2=array();

     if(!is_array($arr['0'])){$arr=array($arr);}

     foreach($arr as $k=> $v){

      foreach($v as $v2){

      if($lower==true) {$v2=strtolower($v2);}

      if(!isset($arr2[$v2])){

          $arr2[$v2]=1;

      }else{

           $arr2[$v2]++;

           }

    }

    }

    return $arr2;

}

/*

Will print:

Array

(

    [red] => 3

    [green] => 3

    [yellow] => 4

    [blue] => 2

    [brown] => 2

    [white] => 1

    [black] => 1

)

*/

?>

down

anvil_sa at NOSPAMNO dot hotmail dot com ¶

2 years ago


Based on sergolucky96 suggestion 
Simple way to find number of items with specific *boolean* values in multidimensional array:

<?php

$list = [
  ['id' => 1, 'result' => true],
  ['id' => 2, 'result' => true],
  ['id' => 3, 'result' => false],
];
$result = true;

echo array_count_values(array_map(function($v) {return $v?'true':'false';},array_column($list, 'result')))[$result]
// outputs: 2

?>

down

Dominic Vonk ¶

8 years ago


The case-insensitive version:

<?php
function array_count_values_ci($array) {
    $newArray = array();
    foreach ($array as $values) {
        if (!array_key_exists(strtolower($values), $newArray)) {
            $newArray[strtolower($values)] = 0;
        }
        $newArray[strtolower($values)] += 1;
    }
    return $newArray;
}
?>

down

rabies dot dostojevski at gmail dot com ¶

15 years ago


I couldn't find a function for counting the values with case-insensitive matching, so I wrote a quick and dirty solution myself:

<pre><?php
function array_icount_values($array) {
    $ret_array = array();
    foreach($array as $value) {
        foreach($ret_array as $key2 => $value2) {
            if(strtolower($key2) == strtolower($value)) {
                $ret_array[$key2]++;
                continue 2;
            }
        }
        $ret_array[$value] = 1;
    }
    return $ret_array;
}

$ar = array('J. Karjalainen', 'J. Karjalainen', 60, '60', 'J. Karjalainen', 'j. karjalainen', 'Fastway', 'FASTWAY', 'Fastway', 'fastway', 'YUP');
$ar2 = array_count_values($ar); // Normal matching
$ar = array_icount_values($ar); // Case-insensitive matching
print_r($ar2);
print_r($ar);
?></pre>

This prints:

Array
(
    [J. Karjalainen] => 3
    [60] => 2
    [j. karjalainen] => 1
    [Fastway] => 2
    [FASTWAY] => 1
    [fastway] => 1
    [YUP] => 1
)
Array
(
    [J. Karjalainen] => 4
    [60] => 2
    [Fastway] => 4
    [YUP] => 1
)

I don't know how efficient it is, but it seems to work. Needed this function in one of my scripts and thought I would share it.

down

-2

pmarcIatIgeneticsImedIharvardIedu ¶

19 years ago


array_count_values function does not work on multidimentional arrays.
If $score[][] is a bidimentional array, the command
"array_count_values ($score)" return the error message "Warning: Can only count STRING and INTEGER values!".

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官方地址：https://www.php.net/manual/en/function.array-count-values.php

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PHP官方手册 - 互联网笔记

array_count_values

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes 6 notes