每个 JSON 字段在数组 php 中重复的次数

Question

我想获取一些代码来获取每个唯一客户端 ID 的列表以及该客户端 ID 在数组中重复的频率。

下面是 JSON 的片段。

如果可能的话，我想要的是类似下面的东西PHP。

Mac 12:12:12:12:12 20 times
Mac 23:23:23:23:23 15 times
Mac 34:34:34:34:34 2 times

请问有简单的方法吗？

谢谢。

罗布

"ranges": [
    {
      "clients": [
        {
          "clientId": {
            "mac": "86:8f:c2:8f:c3:20"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -90.4
            }
          ]
        },
        {
          "clientId": {
            "mac": "6c:19:8f:bf:47:e9"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -91.3
            }
          ]
        },
        {
          "clientId": {
            "mac": "58:6d:8f:75:95:0e"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -86.3
            }
          ]
        },
        {
          "clientId": {
            "mac": "68:72:51:10:e7:26"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -53.7
            }
          ]
        },
        {
          "clientId": {
            "mac": "38:2c:4a:5c:b6:a0"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -87.1
            }
          ]
        },
        {
          "clientId": {
            "mac": "68:72:51:10:e7:29"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -76.9
            }
          ]
        },
        {
          "clientId": {
            "uniqueId": "CQos"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -70.2
            }
          ]
        },
        {
          "clientId": {
            "mac": "a4:ee:57:2e:ac:bd"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -95
            }
          ]
        },
        {
          "clientId": {
            "uniqueId": "ECgg"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -75.4
            }
          ]
        },
        {
          "clientId": {
            "mac": "58:6d:8f:74:bf:f9"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -70
            }
          ]
        }
      ],
      "timestamp": "2015-11-09T22:06:00+00:00"
    },
    {
      "clients": [
        {
          "clientId": {
            "mac": "86:8f:c2:8f:c3:20"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -93
            }
          ]
        },
        {
          "clientId": {
            "mac": "6c:19:8f:bf:47:e9"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -90.8
            }
          ]
        },
        {
          "clientId": {
            "mac": "58:6d:8f:75:95:0e"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -87.2
            }
          ]
        },
        {
          "clientId": {
            "mac": "68:72:51:10:e7:26"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -54.1
            }
          ]
        },
        {
          "clientId": {
            "mac": "38:2c:4a:5c:b6:a0"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -87
            }
          ]
        },
        {
          "clientId": {
            "mac": "68:72:51:10:e7:29"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -77.2
            }
          ]
        },
        {
          "clientId": {
            "uniqueId": "CQos"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -70.8
            }
          ]
        },
        {
          "clientId": {
            "mac": "a4:ee:57:2e:ac:bd"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -95
            }
          ]
        },
        {
          "clientId": {
            "uniqueId": "ECgg"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -72.8
            }
          ]
        },
        {
          "clientId": {
            "mac": "58:6d:8f:74:bf:f9"
          },
          "rssis": [
            {
              "sourceId": "zR1L3",
              "value": -70
            }
          ]
        }
      ],
      "timestamp": "2015-11-09T22:07:00+00:00"
    },

Answer 1

首先遍历 json 并构建一个 mac 地址数组：

$data = json_decode($json, true);
$macs = array();

foreach ($data['ranges'] as $range) {
    foreach ($range['clients'] as $client) {
        // check if the client has a mac address, and add it to the array
        if (isset($client['clientId']['mac'])) {
            $macs[] = $client['clientId']['mac'];
        }
    }
}

那么你可以简单地使用 array_count_values:

var_dump(array_count_values($macs));

这将输出一个以mac地址为键，频率为值的数组：

array (size=8)
  '86:8f:c2:8f:c3:20' => int 2
  '6c:19:8f:bf:47:e9' => int 2
  '58:6d:8f:75:95:0e' => int 2
  '68:72:51:10:e7:26' => int 2
  '38:2c:4a:5c:b6:a0' => int 2
  '68:72:51:10:e7:29' => int 2
  'a4:ee:57:2e:ac:bd' => int 2
  '58:6d:8f:74:bf:f9' => int 2

所以你可以这样做

foreach (array_count_values($macs) as $mac => $frequency)
{
    echo "Mac {$mac} {$frequency} times<br/>";
}

还有其他方法，例如在循环中，您可以检查是否已经看到 mac，然后在进行时将计数加 1。但是这种方式看起来最简单。

Answer 2

不确定是否有简单的方法，但您可以遍历数据并将您的发现存储在数组中。

//parse json
$data = json_decode( $json );

//store mac addresses
$parsed = array();

foreach( $data['ranges'] as $range ) {
    foreach( $range->clients as $client ) {
        $address = $client->clientId->mac;

        if( ! isset( $parsed[$address] ) )
            $parsed[$address] = 0;

        $parsed[$address]++;
    }
}

//output as requested
foreach( $parsed as $mac => $count )
    echo "Mac {$mac} {$count} <br />";

每个 JSON 字段在数组 php 中重复的次数

Amount of times each JSON field is repeated in array php

php

sorting

json

field