array_count_values

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

array_count_values — 统计数组中每个不同值的出现次数

说明

function array_count_values(array $array): array

array_count_values() 返回一个数组: 数组的键(必须是 int 或 string )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 )。

示例

示例 #1 array_count_values() 例子

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

以上示例会输出:

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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down

sergolucky96 at gmail dot com ¶

8 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

rabies dot dostojevski at gmail dot com ¶

19 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

szczepan.krolgmail.c0m ¶

16 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
)
*/
?>