檢查是否在數組存在鍵

Question

編輯：

if(array_key_exists($errcode, $Errors)){ 
    $Data['status'] = -1; 
    $Data['err'] = array(
     "err_code" => $errcode, 
     "err_str" => $Errors[$errcode] 
    ); 
} 

---

我有一個苛刻時間搞清楚，如果一個鍵在陣列存在，我使用array_key_exists方法已經試過，但沒有運氣！我也試過empty（$ array [$ key]）這似乎返回相同的通用錯誤，而不是特定的錯誤。

---

調用ERR（空，3）將輸出：

{ 
    "status": -1, 
    "err": { 
     "err_code": null, 
     "err_str": "Generic error" 
    } 
} 

我使用array_key_exists方法，該方法返回一個布爾值嘗試，但它似乎沒有工作，這是爲什麼？

My site should output error 5: Invalid

---

//Errors ENUM 
$Errors = array(
    0 => "Cannot parse <GameID>", 
    1 => "Invalid steam session", 
    2 => "Invalid <GameID>, non-numeric", 
    3 => "SQL Connection refused", 
    4 => "SQL Query error", 
    5 => "invalid <GameID>" 
); 

function err($status, $errcode){ 
    if(isset($errcode)){ 
     if($Errors[$errcode] != null){ 
      $Data['status'] = -1; 
      $Data['err'] = array(
       "err_code" => $errcode, 
       "err_str" => $Errors[$errcode] 
      ); 
     } else { 
      $Data['status'] = -1; 
      $Data['err'] = array(
       "err_code" => null, 
       "err_str" => "Generic error" 
      ); 
     } 
    } else { 
     $Data['status'] = $status; 
     $Data['err'] = array(
      "err_code" => null, 
      "err_str" => null 
     ); 
    } 
    echo(json_encode($Data, 128 | 32)); 
} 

Answer 1

的err功能並沒有看到全球$錯誤變量。聲明Errors變量爲global內部Err函數：

function err($status, $errcode){ 
    global $Errors; 
    if(isset($errcode)){ 
     if($Errors[$errcode] != null){ 
      $Data['status'] = -1; 
      $Data['err'] = array(
       "err_code" => $errcode, 
       "err_str" => $Errors[$errcode] 
      ); 
     } else { 
      $Data['status'] = -1; 
      $Data['err'] = array(
       "err_code" => null, 
       "err_str" => "Generic error" 
      ); 
     } 
    } else { 
     $Data['status'] = $status; 
     $Data['err'] = array(
      "err_code" => null, 
      "err_str" => null 
     ); 
    } 
    echo(json_encode($Data, 128 | 32)); 
}