在php中找到最大频率元素的最快方法

$a = array(1, 2, 3, 4, 3, 3, 4, 4, 1, 3);
$r = array_count_values($a);
$k = array_search(max($r), $r);
echo "most frequent value is $k";

// Gives us an associative array of id=>count mappings,
$counts = array_count_values($array_ids);
// and sorts it from largest to smallest count
arsort($counts);

// Gets the first key after sorting, which is the id with the largest count
$max_freq_id = key($counts);

使用建议 array_search() 结合 max() 但是,可能比这个更快,因为它不需要对数组进行完全排序,因此将在 O(n) 时间而不是 O(n log n) .

解决同频率多个元件的问题:

$values = array(1, 1, 3, 3, 3, 3, 4, 5, 5, 5, 5, 6); 
$freq   = array_count_values($values);
arsort($freq);
$max = $val = key($freq); 
while(next($freq) && current($freq) == $freq[$max]){
    $val .= ','.key($freq);
}

echo " most frequent value is/are $val ";

这将输出

最常见值为5,3

而且,它比使用array_search和max combo快一点……

尝试 max

$max = max($array_ids);