如何退出if语句并继续其他

Question

这是一个长远的问题，但有没有办法在PHP中退出“if”语句并继续到“else”语句，如果在if块内发生错误？

例如

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

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

} 

else 
{ 
//do method two 
} 

当然是可能的，如果里面的第一个，如果做一个嵌套的，但似乎哈克。

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

我只想用一个功能让你不重复的代码：

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

function elsefunction() { 
    //else code here 
} 

Answer 3

您可以修改methodOne()，使其返回true成功和false的错误：

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

Answer 4

应该可以吗？ 无论如何，你可能会考虑改变它。

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

Answer 5

假设methodOne返回出错假：

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

Answer 6

你真的需要吗？我认为没有...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) ; 

我劝上的方法来分离...

Answer 7

我发现使用开关，而不是如果... else都得心应手这样做：闭口不提break语句使交换机通过转到下一个案例：

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 
}