如何退出if語句並繼續執行else

Question

這是一個長鏡頭問題，但是如果在if塊中發生錯誤，那么在php中有一種方法可以退出“if”語句並繼續執行“else”語句嗎？

例

if ($condition == "good")
{
//do method one

//error occurs during method one, need to exit and continue to else 

}

else 
{
//do method two
}

當然可以在第一個if內部進行嵌套，但這看起來很hacky。

TIA

Answer 1

try {
    //do method one

    //error occurs during method one, need to exit and continue to else 
    if ($condition != "good") {
        throw new Exception('foo');
    }
} catch (Exception $e) {
    //do method two

}

Answer 2

我只是使用一個函數，所以你不重復代碼：

if ($condition == "good") {
    //do method one
    //error occurs during method one
    if($error == true) {
        elsefunction();
    }
} else {
    elsefunction();
}

function elsefunction() {
    //else code here
}

Answer 3

應該可以嗎？ 無論如何，您可能會考慮將其更改為。

$error = "";
if ($condition == "good") {
 if (/*errorhappens*/) { $error = "somerror"; }
}
if (($condition != "good") || ($error != "") ) {
 //dostuff
}

Answer 4

您可以修改methodOne() ，使其在成功時返回true ，在出錯時返回false ：

if($condition == "good" && methodOne()){
  // Both $condition == "good" and methodOne() returned true
}else{
  // Either $condition != "good" or methodOne() returned false
}

Answer 5

假設methodOne在出錯時返回false：

if !($condition == "good" && methodOne())
{
//do method two
}

Answer 6

你真的需要這個嗎？ 我想不...但你可以破解..

do{

   $repeat = false;

   if ($condition == "good")
   {
      //do method one
      $condition = "bad";
      $repeat = true;

    }    
    else 
    {
       //do method two
    }

}while( $ok ) ;

我建議分開的方法......

Answer 7

我發現使用開關而不是if ... else用於執行此操作：省略break語句會使切換進入下一種情況：

switch ($condition) {
case 'good':
    try {
        // method to handle good case.
        break;
    }
    catch (Exception $e) {
        // method to handle exception
        // No break, so switch continues to default case.
    }
default:
    // 'else' method
    // got here if condition wasn't good, or good method failed.
}

Answer 8

if ($condition == "good") {
    try{
        method_1();
    }
    catch(Exception $e){
       method_2();
    }
} 
else {
    method_2();
}

function method_2(){
   //some statement
}