如何计算重复出现的次数

Question

这是我的关联数组，我正在尝试计算此处的出现次数或每个重复项 (r-17-VM) (v-2-VM) 忽略“主机上的控制域”

Array
(
    [0] => Array
        (
            [0] => r-17-VM
            [1] => r-17-VM
            [2] => r-17-VM
            [3] => r-17-VM
            [4] => r-17-VM
            [5] => r-17-VM
            [6] => r-17-VM
            [7] => r-17-VM
            [8] => r-17-VM
            [9] => r-17-VM
            [10] => r-17-VM
            [11] => r-17-VM
            [12] => r-17-VM
            [13] => v-2-VM
            [14] => v-2-VM
            [15] => v-2-VM
            [16] => v-2-VM
            [17] => v-2-VM
            [18] => v-2-VM
            [19] => v-2-VM
            [20] => v-2-VM
            [21] => v-2-VM
            [22] => v-2-VM
            [23] => v-2-VM
            [24] => v-2-VM
            [25] => v-2-VM
            [26] => Control domain on host
            [27] => Control domain on host
            [28] => Control domain on host
            [29] => Control domain on host
            [30] => Control domain on host
            [31] => Control domain on host
        )

)

谢谢

Answer 1

使用array_count_values。它返回一个包含每个值重复次数的数组：

$frequency = array_count_values($array);
var_dump($frequency);

对于您的数组，此输出：

array(3) {
  ["r-17-VM"]=>
  int(13)
  ["v-2-VM"]=>
  int(13)
  ["Control domain on host"]=>
  int(6)
}