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@ 2022-02-16T12:28:39Z

<?php

$rows = [
['3',	'2022-01-03'],
['5,3',	'2022-01-15'],
['4',	'2022-01-27'],
['5',	'2022-02-01'],
['7',	'2022-02-09'],
['3,2',	'2022-01-16'],
];

$counts = [];
foreach($rows as $row){
    $ids = explode(',', $row[0]);
    $month = date('m', strtotime($row[1]));
    foreach($ids as $id){
        if(!array_key_exists($id, $counts)){
            $counts[$id] = [];
        }
        if(!array_key_exists($month, $counts[$id])){
            $counts[$id][$month] = 0;
        }
        
        $counts[$id][$month]++;
    }
}

var_dump($counts);

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: array(5) { [3]=> array(1) { ["01"]=> int(3) } [5]=> array(2) { ["01"]=> int(1) ["02"]=> int(1) } [4]=> array(1) { ["01"]=> int(1) } [7]=> array(1) { ["02"]=> int(1) } [2]=> array(1) { ["01"]=> int(1) } }
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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