Calc percentage of keys

// You can count how many occurences are there, and then calculate the percentage of each.

$statusArr = [
    'On Track',
    'Not Started',
    'On Track',
    'Stuck',
    'Completed',
    'Stuck',
    'On Track',
    'Completed'
];

$percentages = [];
foreach($statusArr as $value) {
    $percentages[$value] = isset($percentages[$value]) ? ++$percentages[$value] : 1;
}

$scalar = 100 / count($statusArr);
foreach ($percentages as $key => $count) {
    $percentages[$key] = $scalar * $count;
}

print_r($percentages);

/*
[On Track] => 37.5
[Not Started] => 12.5
[Stuck] => 25
[Completed] => 25
*/