blocks|key|1242086|text|不，这不可能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1242087|您需要将实例赋给一个变量，然后才能调用它的任何方法。|1242088|如果你真的不想这样做，你可以像ropstah建议的那样使用一个工厂：|1242089|class+ObjFactory{
++public+static+function+newObj(){
++++++return+new+Obj();
++}
}
ObjFactory::newObj()->method();|code-block|syntax|javascript|1242090|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

No, this is not possible. 
You need to assign the instance to a variable before you can call any of it's methods.

If you really wan't to do this you could use a factory as ropstah suggests:

<pre><code>class ObjFactory{
 public static function newObj(){
 return new Obj();
 }
}
ObjFactory::newObj()-&gt;method();
</code></pre>

blocks|key|1456969|text|您可以使用静态工厂方法来生成对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456970|ObjectFactory::NewObj()->method();|code-block|syntax|javascript|1456971|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 could use a static factory method to produce the object:

<pre><code>ObjectFactory::NewObj()-&gt;method();
</code></pre>

blocks|key|1456993|text|这样如何：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456994|$obj+=+new+Obj();+$method_result+=+$obj->method();+//+?|code-block|syntax|javascript|1456995|:P|1456996|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|$]]

How about:

<pre><code>$obj = new Obj(); $method_result = $obj-&gt;method(); // ?
</code></pre>

:P

blocks|key|1457014|text|您可以通过定义一个标识函数来实现更普遍的功能：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1457015|function+identity($x)+{
++++return+$x;
}

identity(new+Obj)->method();|code-block|syntax|javascript|1457016|这样你就不需要为每个类定义一个函数。|1457017|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 do it more universally by defining an identity function:

<pre><code>function identity($x) {
 return $x;
}

identity(new Obj)-&gt;method();
</code></pre>

That way you don't need to define a function for each class.

blocks|key|1242279|text|我也在寻找一行程序来实现这一点，作为将日期从一种格式转换为另一种格式的单个表达式的一部分。我喜欢在一行代码中做到这一点，因为这是一个单一的逻辑操作。因此，这有点神秘，但它允许您在一行中实例化和使用date对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1242280|$newDateString+=+($d+=+new+DateTime('2011-08-30')+?+$d->format('F+d,+Y')+:+'');|code-block|syntax|javascript|1242281|将日期字符串从一种格式转换为另一种格式的另一种方法是使用辅助函数来管理代码的OO部分：|1242282|function+convertDate($oldDateString,$newDateFormatString)+{
++++$d+=+new+DateTime($oldDateString);
++++return+$d->format($newDateFormatString);
}

$myNewDate+=+convertDate($myOldDate,'F+d,+Y');|1242283|我认为面向对象的方法很酷也很有必要，但它有时会很单调乏味，需要太多的步骤才能完成简单的操作。|1242284|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I, too, was looking for a one-liner to accomplish this as part of a single expression for converting dates from one format to another. I like doing this in a single line of code because it is a single logical operation. So, this is a little cryptic, but it lets you instantiate and use a date object within a single line:

<pre><code>$newDateString = ($d = new DateTime('2011-08-30') ? $d-&gt;format('F d, Y') : '');
</code></pre>

Another way to one-line the conversion of date strings from one format to another is to use a helper function to manage the OO parts of the code:

<pre><code>function convertDate($oldDateString,$newDateFormatString) {
 $d = new DateTime($oldDateString);
 return $d-&gt;format($newDateFormatString);
}

$myNewDate = convertDate($myOldDate,'F d, Y');
</code></pre>

I think the object oriented approach is cool and necessary, but it can sometimes be tedious, requiring too many steps to accomplish simple operations.

blocks|key|1457133|text|我看到这是相当老的问题，但我认为这是值得一提的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1457134|名为"__call()“的特殊类方法可用于在类中创建新项。您可以这样使用它：|1457135|<?php
class+test
{

function+__call($func,$args)
{
++++echo+"I+am+here+-+$func\n";
}

}

++++$a+=+new+test();
++++$a->new(+"My+new+class"+);
?>|code-block|syntax|javascript|1457136|输出应为：|1457137|I+am+here+-+new|1457138|因此，您可以欺骗PHP在您的顶级类(或者实际上是任何类)中创建一个“新”命令，并将您的include命令放入__call()函数中以包含您所请求的类。当然，您可能希望测试$func以确保它是发送给__call()命令的“新”命令，当然，由于__call()的工作方式，您还可以使用其他命令。|1457139|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I see this is quite old as questions go but here is something I think should be mentioned:

The special class method called "__call()" can be used to create new items inside of a class. You use it like this:

<pre><code>&lt;?php
class test
{

function __call($func,$args)
{
 echo "I am here - $func\n";
}

}

 $a = new test();
 $a-&gt;new( "My new class" );
?&gt;
</code></pre>

Output should be:

<pre><code>I am here - new
</code></pre>

Thus, you can fool PHP into making a "new" command inside of your top level class (or any class really) and put your include command in to the __call() function to include the class that you have asked for. Of course, you would probably want to test $func to make sure it is a "new" command that was sent to the __call() command and (of course) you could have other commands also because of how __call() works.

blocks|key|1457155|text|简单地说，我们可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1457156|$method_result+=+(new+Obj())->method();|code-block|syntax|javascript|1457157|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|$]]

Simply we can do this

<pre><code>$method_result = (new Obj())-&gt;method();
</code></pre>

What I would like to do is something like this:

<pre><code>$method_result = new Obj()-&gt;method();
</code></pre>

Instead of having to do:

<pre><code>$obj = new Obj();
$method_result = $obj-&gt;method();
</code></pre>

The result doesn't actually matter to me in my specific case. But, is there a way to do this?

In PHP, can you instantiate an object and call a method on the same line?

我想做的事情是这样的：$method_result = new Obj()->method();而不是必须这样做：$obj = new Obj();$method_result = $obj->method();在我的特定情况下，结果实际上对我来说并不重要。但是，有没有办法做到这一点呢？

问在PHP中，您可以在同一行上实例化一个对象和调用一个方法吗？
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问在PHP中，您可以在同一行上实例化一个对象和调用一个方法吗？
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