blocks|key|130462|text|需要引用成员所属的对象才能访问成员。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130463|每个方法调用或属性访问都以$variable->为前缀-+$this是一个引用当前对象实例的神奇变量。它的使用不是可选的。|offset|length|style|CODE|130464|这是因为(还有其他原因)因为PHP中的每个函数都不是方法，还有全局函数。如果引用函数时未将其与对象关联，则假定该函数为全局函数。|130465|作为附注，您应该避免在PHP中使用单例-使用它们不会获得性能/内存增益，因为每个并发执行的脚本都被封闭在自己的内存空间中。|130466|entityMap^0|0|D|B|T|5|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

It is required that you reference the object to which the member belongs in order to access the member.

Every method call or property access is prefixed with <code>$variable-&gt;</code> - <code>$this</code> is a magic variable that refers to the current object instance. Its use is not optional.

This is (amongst other reasons) because not every function in PHP is a method, there are also global functions. If you reference a function without associating it with an object, it is assumed to be a global function.

As a side note, you should avoid the use of singletons in PHP - there is no performance/memory gain to be found from using them because each concurrently executing script is garden-walled into its own memory space.

blocks|key|129814|text|“C%2B%2B”(->)+!=指针。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|129815|$this是指当前的类和实例。所有变量都可以使用$this->variable;或$this->function();进行访问。|129816|可以使用self::$variable或self::function()访问静态变量和函数|129817|在类实例外部，必须指定类实例：$foo->variable;或$foo->function();|129818|据我所知，如果不使用$this->或self::，就无法访问类中的公共/私有/静态/常量变量|129819|关于使用函数的对象...你说了算。您是否计划稍后扩展代码以添加更多功能？所有的函数都有某种程度的关联吗？如果它们是单例函数，那么只编写一个函数而不是一个类并没有什么坏处。这真的取决于你想要实现的目标。|129820|entityMap^0|6|2|0|0|5|O|G|15|I|0|4|F|K|G|0|F|F|V|H|0|A|7|I|6|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1G|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|Q|$]]

The "pointer" (<code>-&gt;</code>) != C++ pointer.

<code>$this</code> means the current class and instance. All variables are accessed by using <code>$this-&gt;variable;</code> or <code>$this-&gt;function();</code>. 

Static variables, and functions can be accessed using <code>self::$variable</code> or <code>self::function()</code>

Outside the class instance, you must indicate the class instance: <code>$foo-&gt;variable;</code> or <code>$foo-&gt;function();</code>

As far as I know, there is no way to access public/private/static/constant variables inside the class without using <code>$this-&gt;</code> or <code>self::</code>

In reference to using an object of functions... up to you. Are you planning on expanding the code later to add more functions? Are all the functions somewhat related? If they are singleton functions, there is no harm in just writing a function instead of a class. It really just depends on what you are trying to accomplish.

blocks|key|731490|text|是的，在访问类方法或变量时，您必须使用$this。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|731491|您需要记住，PHP不要求声明变量，因此请想象以下情况：|731492|<?
class+A+{
++public+$a+=+'Hello+World!';
++function+hello()+{
++++$a+=+'hello';
++++echo+$a;
++}
}

$object+=+new+A();
echo+$object->hello();|code-block|syntax|javascript|731493|$a将是局部作用域，而$this->a将是类变量。|731494|entityMap^0|J|5|0|0|0|0|2|B|8|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

Yes, you do have to use <code>$this</code> when accessing class method's or variables.

You need to remember that PHP doesn't require that variables be declared, so image the following situation:

<pre><code>&lt;?
class A {
 public $a = 'Hello World!';
 function hello() {
 $a = 'hello';
 echo $a;
 }
}

$object = new A();
echo $object-&gt;hello();
</code></pre>

<code>$a</code> would be local scope and <code>$this-&gt;a</code> would be the class variable.

Starting a new PHP project and deciding that after a few years of PHP development, I'm thinking I should really start using PHP classes. I'm used to classes in the C++ world, so there's a few things I'm not quite sure about when porting this knowledge over to PHP. 

In C++, you can automatically access any class variables without a prefix, in PHP, it appears that you need to prefix all such accesses (variables and function) with <code>this-&gt;</code>. I know what <code>this</code> is (or at least I think so, a pointer to the current class instance), but I'm not sure whether its required or preferred, or if there is any alternatives. My class will be using other functions within the same class (ie, itself) fairly heavily, so having to type <code>this-&gt;</code> every time is going to get time consuming quite quickly. 

The classes themselves are likely to be singletons, so I'm not sure whether to actually use a class, or just prefix the functions with an identifier.

PHP: Calling class functions from within a class

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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开始一个新的PHP项目，并决定在经过几年的PHP开发后，我认为我真的应该开始使用PHP类。我习惯了C++世界中的类，所以在将这些知识移植到PHP时，有一些事情我不是很确定。在C++中，您可以自动访问任何没有前缀的类变量，而在PHP中，您似乎需要为所有此类访问(变量和函数)添加前缀this->。我知道this是什么(或者...

问PHP:从类中调用类函数
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