PHP错误信息帮助和try/catch

我想创建一个删除从不断接触用户的功能。这个函数为常量联系调用一个包装类，并且它可以工作，但是如果给它提供一个在他们的站点上不存在的电子邮件地址，它会返回一个可捕获的致命错误。PHP错误信息帮助和try/catch

我是新来的try/catch和我不太得到在哪里放置，这样我可以创造一个优美的错误信息，而不是我发现了捕致命错误。下面是我当前的代码：

function ccdeleteuser($emailaddress) 
{ 
//this code accesses the constant contact wrapper class to delete a user based on email 
$ConstantContact = new ConstantContact("basic", "apikey", "usr", "pwd"); 
$SearchContact = $ConstantContact->searchContactsByEmail($emailaddress); 
$DeleteContact = $ConstantContact->deleteContact($SearchContact[0]); 
} 

$emailtotry = "[email protected]"; //this is email is NOT in Constant Contact 
ccdeleteuser($emailtotry);

现在如果我运行此我得到以下错误：

Catchable fatal error: Argument 1 passed to ConstantContact::deleteContact() must be an instance of Contact, null given, called in [path to my page] on line 19 and defined in [path to constant contact php wrapper file] on line 214

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2011-08-31 Chris Cummings

你应该检查'$ SearchContact'是否是一个数组;那么你不必担心异常。 –

DUP：http://stackoverflow.com/questions/2468487/how-can-i-catch-a-catchable-fatal-error-on-php-type-hinting – xdazz

做到这一点，正确的方法是先测试空：

function ccdeleteuser($emailaddress) 
{ 

    $ConstantContact = new ConstantContact("basic", "apikey", "usr", "pwd"); 
    $SearchContact = $ConstantContact->searchContactsByEmail($emailaddress); 
    // first makes sure that the 0 index of of SearchContact is accessible at all 
    // then it ensures that only something "truthy" will trigger delete -- this 
    // means that if $SearchContact[0] is null, the function won't try to delete 
    if($SearchContact && isset($SearchContact[0]) && $SearchContact[0]) 
     $DeleteContact = $ConstantContact->deleteContact($SearchContact[0]); 
    else 
     echo "Can't do nothin'"; // do something useful? 
}

使用try ...赶上，你可以使它看起来像这样：

function ccdeleteuser($emailaddress) 
{ 

    $ConstantContact = new ConstantContact("basic", "apikey", "usr", "pwd"); 
    $SearchContact = $ConstantContact->searchContactsByEmail($emailaddress); 
    try 
    { 
     // keep this... it is still useful 
     if($SearchContact && isset($SearchContact[0]) && $SearchContact[0]) 
      $DeleteContact = $ConstantContact->deleteContact($SearchContact[0]); 
     else 
      echo "Can't do nothin'"; 
    } 
    catch(Exception $e) 
    { 
     // I'm making up a function "log" which will record that an error 
     // has taken place. It is a good idea to always log all exceptions 
     // so that you don't accidentally obfuscate something important 
     log($e->getMessage()); 
     // do something useful 
    } 
}

作为一般笔记，最好采取主动行动来防止发生例外情况，而不是在事后才抓住它们。我甚至会说，你应该考虑一定要始终竭尽全力防止发生异常，并且只能使用try ... catch作为最后的可能手段。

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2011-08-31 13:56:59 cwallenpoole

谢谢您的回答，第一个非常完美！这种情况下，你在做“试着抓住”这样的事情时会感到很茫然，你忘记了有一种更简单（更有效）的方式！ –

PHP错误信息帮助和try/catch

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