Php 数组仅替换特定键的值

我有两个数组，在json中类似这样（标签）：

数据库中的其他数据如下（数据）：

之后，我尝试使用以下代码使用label替换array以提高数据精度：

foreach($data as $key => $value) {
            $datafinal[$key] = array_replace($label,$value);
        }

输出为（datafinal）：

我想要的是这样的东西：

{
    "EXPORT": [
      {
        "dates": "2019-07-01",
        "c_job": 12
      },
      {
        "dates": "2019-07-02",
        "c_job": 8
      },
      {
        "dates": "2019-07-03",
        "c_job": 0
      },
      {
        "dates": "2019-07-04",
        "c_job": 11
      }
    ],
    "IMPORT": [
      {
        "dates": "2019-07-01",
        "c_job": 0
      },
      {
        "dates": "2019-07-02",
        "c_job": 0
      },
      {
        "dates": "2019-07-03",
        "c_job": 11
      },
      {
        "dates": "2019-07-04",
        "c_job": 0
      }
    ]
  }

---

我尝试了数组reduce和replace

基本上你需要做的是对

$data

中的每个顶级数组，检查0值数组（我称之为

$blank

），看看当前

$data

数组中是否存在日期。如果确实如此，复制该值，否则使用空白值：

$datafinal = array();
foreach ($data as $key => $value) {
    foreach ($blank as $bkey => $bvalue) {
        if (($dkey = array_search($bvalue['dates'], array_column($value, 'dates'))) !== false) {
            $datafinal[$key][$bkey] = $value[$dkey];
        }
        else {
            $datafinal[$key][$bkey] = $bvalue;
        }
    }
}
echo json_encode($datafinal, JSON_PRETTY_PRINT);

输出：

{
    "EXPORT": [
        {
            "dates": "2019-07-01",
            "c_job": 12
        },
        {
            "dates": "2019-07-02",
            "c_job": 8
        },
        {
            "dates": "2019-07-03",
            "c_job": 0
        },
        {
            "dates": "2019-07-04",
            "c_job": 11
        }
    ],
    "IMPORT": [
        {
            "dates": "2019-07-01",
            "c_job": 0
        },
        {
            "dates": "2019-07-02",
            "c_job": 0
        },
        {
            "dates": "2019-07-03",
            "c_job": 11
        },
        {
            "dates": "2019-07-04",
            "c_job": 0
        }
    ]
}

---

我选择了旧的、简单的嵌套的

foreach

循环，尽可能简单快捷（代码中的注释）

而主代码

$template = json_decode('[
    {
      "dates": "2019-07-01",
      "c_job": 0
    },
    {
      "dates": "2019-07-02",
      "c_job": 0
    },
    {
      "dates": "2019-07-03",
      "c_job": 0
    },
    {
      "dates": "2019-07-04",
      "c_job": 0
    }
  ]', true);

$update = json_decode('{
    "EXPORT": [
      {
        "dates": "2019-07-01",
        "c_job": 12
      },
      {
        "dates": "2019-07-02",
        "c_job": 8
      },
      {
        "dates": "2019-07-04",
        "c_job": 11
      }
    ],
    "IMPORT": [
      {
        "dates": "2019-07-03",
        "c_job": 11
      }
    ]
}', true);

// Create blank output array with all entries
$output = ["EXPORT" => $template, "IMPORT" => $template];

// Loop over update data (from database) - you may need to tweak this for your use case
foreach ( $update  as $type => $updateItem )   {
    // Loop over each set of update values (a row of dates and c_job)
    foreach ( $updateItem  as $updateItem )   {
        // Locate in empty output array
        foreach ( $output[$type] as &$item )   {
            // Same date - update
            if ( $updateItem['dates'] == $item['dates']) {
                $item['c_job'] = $updateItem['c_job'];
                // Stop looking as already updated
                break;
            }
        }
    }
}

一个较短但涉及更多的

数组

函数，这将创建以日期为键的模板数组，因此您可以使用输入数据中的日期直接更新数据

// Create template array using dates as the array key
$template = array_column($template, null, 'dates');
$output = ["EXPORT" => $template, "IMPORT" => $template];

foreach ( $update  as $type => $export )   {
    foreach ( $export  as $export )   {
        // Use the combination of type (EXPORT) and dates from the update data
        // to directly update the output (assumes empty value created)
        $output[$type][$export['dates']]['c_job'] = $export['c_job'];
    }
}

// Re-index data to remove dates as keys
$output = ["EXPORT" => array_values($output['EXPORT']), 
    "IMPORT" => array_values($output['IMPORT'])];

“[我]已[尝试]阵列缩减和替换” — 请回答您的问题并分享您的代码。

$template = json_decode('[
    {
      "dates": "2019-07-01",
      "c_job": 0
    },
    {
      "dates": "2019-07-02",
      "c_job": 0
    },
    {
      "dates": "2019-07-03",
      "c_job": 0
    },
    {
      "dates": "2019-07-04",
      "c_job": 0
    }
  ]', true);

$update = json_decode('{
    "EXPORT": [
      {
        "dates": "2019-07-01",
        "c_job": 12
      },
      {
        "dates": "2019-07-02",
        "c_job": 8
      },
      {
        "dates": "2019-07-04",
        "c_job": 11
      }
    ],
    "IMPORT": [
      {
        "dates": "2019-07-03",
        "c_job": 11
      }
    ]
}', true);

// Create blank output array with all entries
$output = ["EXPORT" => $template, "IMPORT" => $template];

// Loop over update data (from database) - you may need to tweak this for your use case
foreach ( $update  as $type => $updateItem )   {
    // Loop over each set of update values (a row of dates and c_job)
    foreach ( $updateItem  as $updateItem )   {
        // Locate in empty output array
        foreach ( $output[$type] as &$item )   {
            // Same date - update
            if ( $updateItem['dates'] == $item['dates']) {
                $item['c_job'] = $updateItem['c_job'];
                // Stop looking as already updated
                break;
            }
        }
    }
}

// Create template array using dates as the array key
$template = array_column($template, null, 'dates');
$output = ["EXPORT" => $template, "IMPORT" => $template];

foreach ( $update  as $type => $export )   {
    foreach ( $export  as $export )   {
        // Use the combination of type (EXPORT) and dates from the update data
        // to directly update the output (assumes empty value created)
        $output[$type][$export['dates']]['c_job'] = $export['c_job'];
    }
}

// Re-index data to remove dates as keys
$output = ["EXPORT" => array_values($output['EXPORT']), 
    "IMPORT" => array_values($output['IMPORT'])];