Find the most common number

<?php
$line = trim(fgets(STDIN));
$nums = explode(' ', $line);

$nums2Freq = [];
$currentMaxFreq = 1;
$currentMaxNum = $nums[0];
foreach ($nums as $num) {
    if (!isset($nums2Freq[$num])) {
        $nums2Freq[$num]=1;
    } else {
        $nums2Freq[$num]++;
    }
    if ($nums2Freq[$num] > $currentMaxFreq) {
        $currentMaxFreq = $nums2Freq[$num];
        $currentMaxNum = $num;
    }
}

echo $currentMaxNum;