find the mode of all nodes in a linked list in php

main.php
function findMode($head) {
    // initialize an empty array to store the count of each value
    $count = array();
    
    // traverse through the linked list
    while ($head != null) {
        $value = $head->data;
        
        // increment the count of the node's value
        if (isset($count[$value])) {
            $count[$value]++;
        } else {
            $count[$value] = 1;
        }
        
        $head = $head->next;
    }
    
    // find the mode (the value with the highest count)
    $mode = null;
    $maxCount = 0;
    foreach ($count as $value => $valueCount) {
        if ($valueCount > $maxCount) {
            $mode = $value;
            $maxCount = $valueCount;
        }
    }
    
    return $mode;
}
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