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 — Zählt die Vorkommen jedes einzelnen Wertes in einem Array
Beschreibung
array_count_values() gibt ein Array zurück, in dem die
Werte des Arrays array (die vom Typ Integer oder
String sein müssen) als Schlüssel und die Häufigkeit ihres Auftretens als
Werte angegeben sind.
Parameter-Liste
-
array -
Das Array mit den zu zählenden Werten
Rückgabewerte
Gibt ein assoziatives Array mit den Werten aus array
als Schlüsseln und der Anzahl als Werten zurück.
Beispiele
Beispiel #1 array_count_values()-Beispiel
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
Siehe auch
- count() - Zählt alle Elemente eines Arrays oder eines Countable-Objekts
- array_unique() - Entfernt doppelte Werte aus einem Array
- array_values() - Liefert alle Werte eines Arrays
- count_chars() - Gibt Informationen über die in einem String enthaltenen Zeichen zurück
add a note
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
?>
