如何從stdClass的對象數組re​​trive價值

Question

有無陣列象下面這樣：

Array 
(
[0] => stdClass Object 
    (
     [city_id] => 2222 
     [city_name] => newCity 
    ) 

[1] => stdClass Object 
    (
     [city_id] => 4444 
     [city_name] => oldCity 
    ) 

[2] => stdClass Object 
    (
     [city_id] => 6666 
     [city_name] => newCity2 

    ) 
) 

現在，我要得到city_id當我設置city_name，我怎樣才能得到它在我的代碼？

例如，如果我設置爲newCity2然後city_name我看到6666爲city_id，如果你想看到一個特定的數據，那麼你通過它等

Answer 1

你需要環路

foreach($data as $key=>$val){ 
    echo 'City ID ::'.$val->city_id."<br />"; 
    echo 'City Name ::'.$val->city_name."<br />"; 
} 

可以修改爲

foreach($data as $key=>$val){ 
    if($val->city_name == 'newCity2'){ 
    echo 'City ID ::'.$val->city_id."<br />"; 
    break; 
    } 
} 


function getCityIDByName($cityname,$data){ 

    $return = ''; 
    foreach($data as $key=>$val){ 
      if($val->city_name == $cityname){ 
      $return = $val->city_id 
      break; 
      } 
    } 
    return $return ; 
} 

$city_id = getCityIDByName ('newCity2',$data); 

Answer 2

您將不得不迭代數組並檢查city_name獲取相應的ID。您最初也可以這樣做，以設置一個數組，其中city_name作爲鍵，city_id作爲值。

foreach ($array as $value) { 
    if ($value->city_name == $compareCityName) { 
     $city_id = $value->city_id; 
    } 
}