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
?>
array_count_values
(PHP 4, PHP 5, PHP 7, PHP 8)
array_count_values — Compte les occurrences de chaque valeur distincte dans un tableau
Description
Retourne un tableau contenant les valeurs du tableau
array (qui doivent être des entiers ou des chaîne de caractèress)
comme clés et leur fréquence comme valeurs.
Liste de paramètres
-
array -
Le tableau de valeurs à compter
Valeurs de retour
Retourne un tableau associatif de valeurs ayant les clés correspondant à
array et leurs nombres comme valeurs.
Erreurs / Exceptions
Lance une alerte de niveau E_WARNING pour chaque élément qui
n'est pas une chaîne de caractères ou un entier.
Exemples
Exemple #1 Exemple avec array_count_values()
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>L'exemple ci-dessus va afficher :
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
Voir aussi
- count() - Compte tous les éléments d'un tableau ou dans un objet Countable
- array_unique() - Dédoublonne un tableau
- array_values() - Retourne toutes les valeurs d'un tableau
- count_chars() - Retourne des statistiques sur les caractères utilisés dans une chaîne
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User Contributed Notes 8 notes
sergolucky96 at gmail dot com ¶
6 years ago
szczepan.krolgmail.c0m ¶
14 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 $arr2;
}
/*
Will print:
Array
(
[red] => 3
[green] => 3
[yellow] => 4
[blue] => 2
[brown] => 2
[white] => 1
[black] => 1
)
*/
?>
rabies dot dostojevski at gmail dot com ¶
17 years ago
I couldn't find a function for counting the values with case-insensitive matching, so I wrote a quick and dirty solution myself:
<pre><?php
function array_icount_values($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.
pmarcIatIgeneticsImedIharvardIedu ¶
21 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!".
anvil_sa at NOSPAMNO dot hotmail dot com ¶
4 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')))[$result]
// outputs: 2
?>
Dominic Vonk ¶
10 years ago
The case-insensitive version:
<?php
function array_count_values_ci($array) {
$newArray = array();
foreach ($array as $values) {
if (!array_key_exists(strtolower($values), $newArray)) {
$newArray[strtolower($values)] = 0;
}
$newArray[strtolower($values)] += 1;
}
return $newArray;
}
?>
Rmr ¶
1 year ago
If you have a multidimensional array with unknown dimensions, you cannot use this function, use instead:
<?php
function array_count_recursive(array $arr): array {
$occurrences = [] ;
array_walk_recursive( $arr, function($value, $key) use (&$occurrences) {
@ $occurrences[$value]++;
// @ to surpress warnings "Undefined array key". In php8 you can also use
// $occurrences[$value] = ($occurrences[$value] ?? 0) + 1
});
return $occurrences;
}
?>
tyler at tloc dot com ¶
1 year ago
A cleaner way to use array_count_values() to find boolean counts.
<?php
$list = [
['id' => 1, 'result' => true],
['id' => 2, 'result' => true],
['id' => 3, 'result' => false],
];
$result = true;
echo array_count_values(array_map('intval', array_column($list, 'result')))[(int)$result];
// outputs: 2
?>
