Count number of occurrences of value in a PHP array

Question

I have loaded the results of an SQL query into an array. The fields are ComputerName , time_in_days , room , keyed on ComputerName .

I would like to find out how many times each time_in_days occurrence happens.

Example values of array are:

[STU-CZC1087SNC] => Array
    (
        [ComputerName] => STU-CZC1087SNC
        [time_in_days] => 0
        [room] => 4Q08
    )

[STU-CZC02501QT] => Array
    (
        [ComputerName] => STU-CZC02501QT
        [time_in_days] => 12
        [room] => 2R017
    )

So I want to know how many computers have time_in_days = 12 , and how many have time_in_days = 0 for example.

It will be used to plot a graph.

How do I do / what is the best way of doing this?

Answer 1

$result = count(
    array_filter(
        $myArray,
        function($value) {
            return $value['time_in_days'] == 12;
        }
    )
);

Answer 2

Try this, where $input is your array of arrays with the computer data:

$result = array();
foreach($input as $computerName => $arr){
  if(!isset($result[ $arr['time_in_days'] ]))
    $result[ $arr['time_in_days'] ] = 0;
  $result[ $arr['time_in_days'] ]++;
}
return $result;

The result will be something like:

[
  12 => 2, //2 computers have time_in_days of 12
  0 => 1  //1 computer has time_in_days of 0
]

Answer 3

OK, here's the working example:

<?php

$computerarray = [
'STU-CZC1087SNC' => Array
(
    'ComputerName' => 'STU-CZC1087SNC',
    'time_in_days' => 0,
    'room' => '4Q08'
),

'STU-CZC02501QT' => Array
(
    'ComputerName' => 'STU-CZC02501QT',
    'time_in_days' => 12,
    'room' => '2R017'
),
'STU-CZC02501QF' => Array
(
    'ComputerName' => 'STU-CZC02501QT',
    'time_in_days' => 12,
    'room' => '2R017'
)    
];


$myarray = array();
foreach($computerarray as $key => $val){
    $myarray[] = $val['time_in_days'];
}

echo "<pre>";
$myarray = array_count_values($myarray);
print_r($myarray);

Answer 4

This should work -

$my_arr = Array();
array_walk($arr, function($v) use(&$my_arr) {$my_arr[] = $v['time_in_days'];});
$time_freq = array_count_values($my_arr);
var_dump($time_freq);
/**
  OUTPUT
**/
array
  0 => int 1
  12 => int 2

Answer 5

I'll remove my comment on the question that says:

The best way to do this is to not use php, but sql to GROUP BY time_in_days and call COUNT() . Here's a push in the right direction .

As for a conditional-less, functional approach, here is a one-liner using the two functions that were specifically designed for this task: array_count_values() and array_column()

Code: ( Demo )

$computerarray = [
    'STU-CZC1087SNC' => ['ComputerName' => 'STU-CZC1087SNC','time_in_days' => 0,'room' => '4Q08'],
    'STU-CZC02501QT' => ['ComputerName' => 'STU-CZC02501QT','time_in_days' => 12,'room' => '2R017'],
    'STU-CZC02501QF' => ['ComputerName' => 'STU-CZC02501QT','time_in_days' => 12,'room' => '2R017']    
];

var_export(array_count_values(array_column($computerarray,'time_in_days')));

Output:

array (
  0 => 1,
  12 => 2,
)

Answer 6

也许array_count_values，请参见手册： http ：//pl1.php.net/array_count_values

Answer 7

foreach($ya as $a) {
    $newarr[$a['time_in_days']]++;
}

Answer 8

$total = null; 
foreach ($members as $owner): 
    if($owner['circle_id'] == $c['id']): // or if($owner['circle_id'] == 1):
        $total = $total + 1;
    endif;
endforeach;
echo $total;

This code calculates the number of members within a circle. It matches the members Table id with the current circle id. Its current value is $c['id'] = 1