如何搜索值以获取密钥并使用该密钥获取另一个阵列中的另一个密钥？

Question

我有一个很大的关联数组，其中有许多键和值，看起来像这样。我想搜索“经常”的特定值并检索具有该值的所有密钥。

$data = array(
'token' => 'token', 
'content' => 'record', 
'format' => 'json', 
'type' => 'flat', 
'records' => array($record), 
'fields' => array(), 
'returnFormat' => 'json' 
); 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, 'url'); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST'); 
curl_setopt($ch, CURLOPT_FRESH_CONNECT, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data, '', '&')); 
$output = curl_exec($ch); 
$row = json_decode($output, true); 

foreach ($row[0] as $key => $value) { 

       $first_array=array($variable_name=>$value); 

       $often_variable=array_search("Often <br> (3)", $first_array);     
      } 

然后，我想使用我的第二个数组，它具有该键作为其值，并将该数组的键打印到表中。

$objPHPExcel = PHPExcel_IOFactory::load("123.csv"); 

foreach ($objPHPExcel->getWorksheetIterator() as $worksheet) { 
$worksheetTitle  = $worksheet->getTitle(); 
$highestRow   = $worksheet->getHighestRow(); // e.g. 10 
$highestColumn  = $worksheet->getHighestColumn(); // e.g 'F' 
$highestColumnIndex = PHPExcel_Cell::columnIndexFromString($highestColumn); 
$nrColumns = ord($highestColumn) - 64; 

for ($row2 = 2; $row2 <= $highestRow; ++ $row2) { 
    $variable_name = $worksheet->getCellByColumnAndRow(0, $row2)->getValue(); 
    $field_label = $worksheet->getCellByColumnAndRow(4, $row2)->getValue(); 

    $second_array=array($field_label=>$variable_name) 
} 

我已经使用了array_search（）但不确定这是否是这个用例的最佳选项。

Answer 1

foreach ($first_array as $var_name => $val){ 
    if ($value == "Often"){ 
     foreach ($second_array as $field_label => $variable_name){ 
     if ($variable_name == $var_name){ 
      echo "field_label: $field_label\n"; 
     }; 
     } 
    } 
    }