PHP 如果值为空或 NULL，多维数组键搜索和值函数不工作

Question

我有两个数组，一个从 .cvs 文件加载，一个从 db table 加载。这个想法是匹配并删除数据库数组中的任何重复条目，最后得到需要从 table.

中删除的数据库记录列表

但是，当'item_code'为空值或NULL时，似乎没有匹配。我在函数和代码中尝试了 == ""、=== null、is_null() 和 empty() 的所有组合，但我保持不变结果。

这可能是非常明显的事情，但我无法在我的生活中看到这里的问题。有人介意试一试吗？

两个数组如下：

$arr_from_csv = array(
  array(
    "item_code"         => '',
    "debtor_code"       => '3CAS0001',
    "agent"             => 'CCCS-N',
    "doc_date"          => '2021-06-05',
    "total_value"       => '576.00',
    "total_quantity"    => '1.0000'
  ),
  array(
    "item_code"         => null,
    "debtor_code"       => '3CAS0001',
    "agent"             => 'CCCS-N',
    "doc_date"          => '2021-06-14',
    "total_value"       => '290.00',
    "total_quantity"    => '2.0000'
  ),
  array(
    "item_code"         => "FMDU - 100 (BIO)",
    "debtor_code"       => "3BER0001",
    "agent"             => "VLHZ",
    "doc_date"          => "2021-06-01",
    "total_value"       => "1482.37",
    "total_quantity"    => "168.0000"
  ),
  array(
    "item_code"         => '',
    "debtor_code"       => '3CAS0001',
    "agent"             => 'CCCS-N',
    "doc_date"          => '2021-06-21',
    "total_value"       => '151.02',
    "total_quantity"    => '9.0000'
  )
);

$arr_from_db = array(
  array(
    "id"                => "3738",
    "item_code"         => NULL,
    "debtor_code"       => "3CAS0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-05",
    "total_value"       => "576.00",
    "total_quantity"    => "1.0000",
    "date_added"        => "2021-06-10",
    "last_updated_date" => "0000-00-00 00:00:00",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210610-0922_saledata.csv"
  ),
  array(
    "id"                => "3787",
    "item_code"         => NULL,
    "debtor_code"       => "3CAS0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-14",
    "total_value"       => "290.00",
    "total_quantity"    => "2.0000",
    "date_added"        => "2021-06-14",
    "last_updated_date" => "2021-06-14 21:54:34",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210614-1356_saledata.csv"
  ),
  array(
    "id"                => "3664",
    "item_code"         => "FMDU - 100 (BIO)",
    "debtor_code"       => "3BER0001",
    "agent"             => "VLHZ",
    "doc_date"          => "2021-06-01",
    "total_value"       => "1482.37",
    "total_quantity"    => "168.0000",
    "date_added"        => "2021-06-10",
    "last_updated_date" => "0000-00-00 00:00:00",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210610-0922_saledata.csv"
  ),
  array(
    "id"                => "3975",
    "item_code"         => NULL,
    "debtor_code"       => "3CAS0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-21",
    "total_value"       => "151.02",
    "total_quantity"    => "9.0000",
    "date_added"        => "2021-06-21",
    "last_updated_date" => "2021-06-22 09:41:53",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210622-0932_saledata.csv"
  ),
  array(
    "id"                => "4009",
    "item_code"         => "FGT- LG300g",
    "debtor_code"       => "3HON0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-21",
    "total_value"       => "-50.58",
    "total_quantity"    => "-1.0000",
    "date_added"        => "2021-06-22",
    "last_updated_date" => "2021-06-22 09:41:53",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210622-0932_saledata.csv"
  )
);

我用来做搜索的函数：

function multidimensional_search($parents, $searched) {
  if (empty($searched) || empty($parents)) {
    return false;
  }

  foreach ($parents as $key => $value) {
    $exists = true;
    foreach ($searched as $skey => $svalue) {
      if (is_null($svalue)) {
        $exists = ($exists && IsSet($parents[$key][$skey]) && $parents[$key][$skey] === null);
      }
      else {
        $exists = ($exists && IsSet($parents[$key][$skey]) && $parents[$key][$skey] == $svalue);
      }
    }
    if($exists){ return $key; }
  }

  return false;
}

最后，代码

foreach ($arr_from_csv as $ikey => $ivalue) {
  $matchkey = multidimensional_search($arr_from_db, $ivalue);
  if(!$matchkey) {
    echo "Key [" . $ikey . "] not found.<br>";
    //echo "<pre>"; var_dump($ivalue); echo "</pre>";
  }
  else {
    echo "Key [" . $ikey . "] found.<br>";
    unset($arr_from_db[$matchkey]);
  }
}

echo "REMAINING ARRAY CONTAINS " . count($arr_from_db);
//echo "<pre>"; var_dump($arr_from_db); echo "</pre>";

/*
  RESULT:
  Key [0] not found.  
  Key [1] not found.  
  Key [2] found.
  Key [3] not found.  
  REMAINING ARRAY CONTAINS 4
*/

Answer 1

使用简单的array_filter()方法：

$arr_from_db = array(
  array(
    "id"                => "3738",
    "item_code"         => '',
    "debtor_code"       => "3CAS0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-05",
    "total_value"       => "576.00",
    "total_quantity"    => "1.0000",
    "date_added"        => "2021-06-10",
    "last_updated_date" => "0000-00-00 00:00:00",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210610-0922_saledata.csv"
  ),
  array(
    "id"                => "4009",
    "item_code"         => "FGT- LG300g",
    "debtor_code"       => "3HON0001",
    "agent"             => "CCCS-N",
    "doc_date"          => "2021-06-21",
    "total_value"       => "-50.58",
    "total_quantity"    => "-1.0000",
    "date_added"        => "2021-06-22",
    "last_updated_date" => "2021-06-22 09:41:53",
    "last_updated_user" => "0",
    "filename"          => "dashboard_20210622-0932_saledata.csv"
  )
);


$test = array_filter($arr_from_db, function ($record){
        return $record['item_code'] != ''; 
    });

 print_r($test);

输出将是：

Array ( 
[1] => Array (
[id] => 4009
[item_code] => FGT- LG300g 
[debtor_code] => 3HON0001 
[agent] => CCCS-N 
[doc_date] => 2021-06-21 
[total_value] => -50.58 
[total_quantity] => -1.0000 
[date_added] => 2021-06-22 
[last_updated_date] => 2021-06-22 09:41:53 
[last_updated_user] => 0 
[filename] => dashboard_20210622-0932_saledata.csv 
) 
)

PHP 如果值为空或 NULL，多维数组键搜索和值函数不工作

PHP multidimensional array search by key and value funtion not working if value is empty or NULL

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