blocks|key|1286260|text|message参数在Exception构造函数中是可选的。所以如果你不想放-就不要：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1286261|throw+new+Exception;|code-block|syntax|javascript|1286262|但是仍然必须抛出Exception类的实例(或扩展它的类)，因为它是php语言语法的一部分。|1286263|entityMap^0|0|7|A|9|0|0|8|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

<code>message</code> parameter is optional in the <code>Exception</code> constructor. So if you don't have/want to put - just don't:

<pre><code>throw new Exception;
</code></pre>

But you still must throw an instance of the <code>Exception</code> class (or a class that extends it), since it is a part of the php language syntax.

blocks|key|1763074|text|如PHP手册所述|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1763075|抛出的对象必须是异常类的实例或异常的子类。尝试抛出一个不是的对象将导致PHP致命错误。|blockquote|1763076|您可以在没有任何消息的情况下抛出异常：|1763077|throw+new+Exception();|code-block|syntax|javascript|1763078|也许可以帮助您避免重复相同的例外情况，如下所示：|1763079|$e+=+new+Exception('something+is+wrong');

try+{
++++throw+$e;
}+catch+(Exception+$ex)+{
++++echo+$ex->getMessage();
}|1763080|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/language.exceptions.php^0|1|5|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@]|C|$]]|$1|G|3|H|5|6|7|14|8|@]|9|@]|C|$]]|$1|I|3|J|5|K|7|15|8|@]|9|@]|C|$L|M]]|$1|N|3|O|5|6|7|16|8|@]|9|@]|C|$]]|$1|P|3|Q|5|K|7|17|8|@]|9|@]|C|$L|M]]|$1|R|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|S|$T|$5|U|V|W|C|$X|Y]]]]

As stated in the <a href="http://php.net/manual/en/language.exceptions.php" rel="nofollow">PHP manual</a>:

<blockquote>
 The thrown object must be an instance of the Exception class or a subclass of Exception. Trying to throw an object that is not will result in a PHP Fatal Error.
</blockquote>

You can throw an exception without any message:

<pre><code>throw new Exception();
</code></pre>

Perhaps something to help you from duplicating the same exception is as follows:

<pre><code>$e = new Exception('something is wrong');

try {
 throw $e;
} catch (Exception $ex) {
 echo $ex-&gt;getMessage();
}
</code></pre>

blocks|key|1763103|text|每次你需要的时候，你都可以使用下面的抛出。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1763104|throw+new+Exception();|code-block|syntax|javascript|1763105|并将保持与您的代码相同。|1763106|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can use the below throw everytime you need.

<pre><code>throw new Exception();
</code></pre>

and catch will remain same as your code.

blocks|key|1283377|text|不能单独使用throw关键字。但是，您可以使用throw+new+Exception();而不指定$message参数，因为它只会返回到默认消息。查看PHP手册中的异常部分：http://php.net/manual/en/language.exceptions.extending.php|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1283378|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/language.exceptions.extending.php^0|6|5|N|M|1D|8|2F|1M|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You cannot use the <code>throw</code> keyword on its own. However, you can use <code>throw new Exception();</code> without specify the <code>$message</code> parameter, because it'll just fallback to the default message. Check out the Exceptions section in the PHP manual: <a href="http://php.net/manual/en/language.exceptions.extending.php" rel="nofollow">http://php.net/manual/en/language.exceptions.extending.php</a>

blocks|key|1286289|text|如果希望所有异常都具有相同的消息，则可以扩展它并在类中定义该消息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1286290|class+AmbiguousException+extends+Exception+{
++++public+function+__construct($message+=+'Something+is+wrong.',+$code+=+0,+Exception+$previous+=+null)+{
+++++++parent::__construct($message,+$code,+$previous);
++++}+
}|code-block|syntax|javascript|1286291|然后：|1286292|throw+new+AmbiguousException();|1286293|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you want all your exceptions to have the same message, you can extend it and define the message in your class:

<pre><code>class AmbiguousException extends Exception {
 public function __construct($message = 'Something is wrong.', $code = 0, Exception $previous = null) {
 parent::__construct($message, $code, $previous);
 } 
}
</code></pre>

Then:

<pre><code>throw new AmbiguousException();
</code></pre>

blocks|key|2517800|text|您可以创建一个包含默认消息的实例，然后抛出该实例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2517801|$Exception+=+new+Exception("some+error+message!");
try+{
++++throw+$Exception;
}+catch+(Exception+$ex)+{
++++var_dump($ex);
}|code-block|syntax|javascript|2517802|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can create an instance with default message and then throw that instance.

<pre><code>$Exception = new Exception("some error message!");
try {
 throw $Exception;
} catch (Exception $ex) {
 var_dump($ex);
}
</code></pre>

Here is my code:

<pre><code>try {

 if ( condition 1 ) {
 throw;
 } else {
 // do something
 }

 // some code here

 if ( condition 2 ){
 throw;
 }

} catch (Exception $e) {
 echo "something is wrong";
}
</code></pre>

As you see, my <code>catch</code> block has its own error message, And that message is a constant. So really I don't need to pass a message when I use <code>throw</code> like this:

<pre><code>throw new Exception('error message');
</code></pre>

Well can I use <code>throw</code> without anything? I just need to jump into <code>catch</code> block.

Honestly writing an useless error message is annoying for me.

<hr>

As you know my current code has a syntax error: (it referring to <code>throw;</code>)

<blockquote>
 Parse error: syntax error, unexpected ';' in {path}
</blockquote>

Can I use throw without any message?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是我的代码：try {    if ( condition 1 ) {        throw;    } else {        // do something    }    // some code here    if ( condition 2 ){        throw;    }} catch...

问我可以在没有留言的情况下使用“掷”吗？
EN

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问我可以在没有留言的情况下使用“掷”吗？EN