How to find the mode of an array in PHP

Question

I have an array that has been sorted from low to high which has over 260k values in. I have found out the mean(average) and median of the array just need to find out the mod

Answer 1

Mathematical only solution:

    //sample data
$dataArr = ["1", "3", "5", "1", "3", "7", "1", "8", "1"];

//a multidimensional array to hold the keys (extracted fro above) and their values (number of occurrences)
$multiDArr = [];
for ($i = 0; $i < count($dataArr); $i++) {
    $key = $dataArr[$i];

    if (isset($multiDArr[$key])) {
        //key already exists; increment count of its value
        $multiDArr[$key] = $multiDArr[$key] + 1;
    } else {
        //key does nto exist; add it and an inital value of 1
        $multiDArr[$key] = 1;
    }
}

$highestOccuring = 0;
$highestOccuringKey = null;
foreach ($multiDArr as $key => $value) {

    if ($value > $highestOccuring) {
        $highestOccuring = $value;
        $highestOccuringKey = $key;
    }

}

echo "MODE / highest occuring key: " . $highestOccuringKey;