PHP统计二维数组元素个数的方法_php实例
1. 首先从数据库的congtent字段读取数据,并把它们合并成一个字符串。
while($myrow = $connector -> fetch_array($result))
{
//$r[] = explode(",", $myrow["content"]);
$str .= $myrow["content"].',';
}
$arr_str = substr($str, 0, -1);
?>
由于最后一个数后面有逗号,所以要对字符串进行截取。
2. 将字符串按逗号分割成数组。
$r = explode(",", $arr_str);
3. 用 array_count_values() 统计一维数组的元素个数
由于array_count_values()貌似不能直接对二维数组的元素进行个数统计,所以进行了上面的两个步骤,得到一个一维数组。
array_count_values() 函数用于统计数组中所有值出现的次数。返回一个数组,其元素的键名是原数组的值,键值是该值在原数组中出现的次数。
$rs = array_count_values($r);
4. 排序
asort($rs);
echo '
';<br>print_r($rs);<br>echo '

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