How to count specific value from array PHP? - php

Question

I have an multidimensional array and I need to count their specific value
Array
(
[0] => Array
(
[Report] => Array
(
[id] => 10
[channel] => 1
)
)
[1] => Array
(
[Report] => Array
(
[id] => 92
[channel] => 0
)
)
[2] => Array
(
[Report] => Array
(
[id] => 18
[channel] => 0
)
)
[n] => Array
)
I need to get output like that: channel_1 = 1; channel_0 = 2 etc
I made a function with foreach:
foreach ($array as $item) {
echo $item['Report']['channel'];
}
and I get: 1 0 0 ... but how can I count it like: channel_1 = 1; channel_0 = 2, channel_n = n etc?

Answer 1

Try this. See comments for step-by-step explanation.
Outputs:
array(2) {
["channel_1"]=>
int(1)
["channel_0"]=>
int(2)
}
Code:
<?php
// Your input array.
$a =
[
[
'Report' =>
[
'id' => 10,
'channel' => 1
]
],
[
'Report' =>
[
'id' => 92,
'channel' => 0
]
],
[
'Report' =>
[
'id' => 18,
'channel' => 0
]
]
];
// Output array will hold channel_N => count pairs
$result = [];
// Loop over all reports
foreach ($a as $report => $values)
{
// Key takes form of channel_ + channel number
$key = "channel_{$values['Report']['channel']}";
if (!isset($result[$key]))
// New? Count 1 item to start.
$result[$key] = 1;
else
// Already seen this, add one to counter.
$result[$key]++;
}
var_dump($result);
/*
Output:
array(2) {
["channel_1"]=>
int(1)
["channel_0"]=>
int(2)
}
*/

Answer 2

You can easily do this without a loop using array_column() and array_count_values().
$reports = array_column($array, 'Report');
$channels = array_column($reports, 'channel');
$counts = array_count_values($channels);
$counts will now equal an array where the key is the channel, and the value is the count.
Array
(
[1] => 1
[0] => 2
)