array_count_values of a multi dimensional array? - php

Question

I have searched this question a lot. But I could not find a proper solution anywhere. Just like you do an array_count_values() for a single dimensional array, what do you do for a multi dimensional array if you want similar type of a solution?
For example-
Array
(
[0] => Array
(
[07/11] => 134
)
[1] => Array
(
[07/11] => 134
)
[2] => Array
(
[07/11] => 145
)
[3] => Array
(
[07/11] => 145
)
[4] => Array
(
[07/12] => 134
)
[5] => Array
(
[07/12] => 99
)
)
The output that I want is-
Date: 07/11, ID: 134, Count: 2
Date: 07/11, ID: 145, Count: 2
Date: 07/12, ID: 135, Count: 1
Date: 07/12, ID: 99, Count: 1
How do I do this?

Answer 1

Using the variable $arr for your array, you could do this:
$out = array();
foreach ($arr as $key => $value){
foreach ($value as $key2 => $value2){
$index = $key2.'-'.$value2;
if (array_key_exists($index, $out)){
$out[$index]++;
} else {
$out[$index] = 1;
}
}
}
var_dump($out);
Output:
Array
(
[07/11-134] => 2
[07/11-145] => 2
[07/12-134] => 1
[07/12-99] => 1
)
Here's another version that produces it as a multidimensional array:
$out = array();
foreach ($arr as $key => $value){
foreach ($value as $key2 => $value2){
if (array_key_exists($key2, $out) && array_key_exists($value2, $out[$key2])){
$out[$key2][$value2]++;
} else {
$out[$key2][$value2] = 1;
}
}
}
Output:
Array
(
[07/11] => Array
(
[134] => 2
[145] => 2
)
[07/12] => Array
(
[134] => 1
[99] => 1
)
)

Answer 2

<?php
$array = array(array('07/11' => '134'), array('07/11' => '134'), array('07/12' => '145'));
$count = array();
foreach ($array as $val) {
foreach ($val as $key => $subval) {
$count[$key]++;
}
}
print_r($count);

Answer 3

In your place I would have altered the structure of the data array. In your case:
Array(
[07/11] => Array
(
[0] => 134,
[1] => 134,
[2] => 145,
[3] => 145,
...
)
)

Answer 4

Smart way, We know that array_count_values(): Counts all the values of an array
Just like you do an array_count_values() for a single dimensional array, what do you do for a multi dimensional array.
We do it by turning it to one single dimensional array, then we call our funciton
$input = array(
array('07/11' => '134'),
array('07/11' => '134'),
array('07/11' => '145'),
array('07/11' => '145'),
array('07/12' => '134'),
array('07/12' => '99')
);
$output = [];
foreach ($input as $inner){
foreach ($inner as $key => $value){
$output[] = "Date: $key, ID: $value, Count:";
}
}
OUTPUT: as you expect
foreach(array_count_values($output) as $key => $value) {
echo "$key $value<br>";
}
/*Date: 07/11, ID: 134, Count: 2
Date: 07/11, ID: 145, Count: 2
Date: 07/12, ID: 135, Count: 1
Date: 07/12, ID: 99, Count: 1*/