blocks|key|1438107|text|当你创建一个类时，你有(在许多情况下)实例变量和方法(也称为。函数)。$this访问这些实例变量，以便您的函数可以获取这些变量，并执行您想要对它们执行的任何操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1438108|meder例子的另一个版本：|1438109|class+Person+{

++++protected+$name;++//can't+be+accessed+from+outside+the+class

++++public+function+__construct($name)+{
++++++++$this->name+=+$name;
++++}

++++public+function+getName()+{
++++++++return+$this->name;
++++}
}
//+this+line+creates+an+instance+of+the+class+Person+setting+"Jack"+as+$name.++
//+__construct()+gets+executed+when+you+declare+it+within+the+class.
$jack+=+new+Person("Jack");+

echo+$jack->getName();

Output:

Jack|code-block|syntax|javascript|1438110|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

when you create a class you have (in many cases) instance variables and methods (aka. functions). $this accesses those instance variables so that your functions can take those variables and do what they need to do whatever you want with them.

another version of meder's example:

<pre><code>class Person {

 protected $name; //can't be accessed from outside the class

 public function __construct($name) {
 $this-&gt;name = $name;
 }

 public function getName() {
 return $this-&gt;name;
 }
}
// this line creates an instance of the class Person setting "Jack" as $name. 
// __construct() gets executed when you declare it within the class.
$jack = new Person("Jack"); 

echo $jack-&gt;getName();

Output:

Jack
</code></pre>

blocks|key|1223398|text|学习PHP语言中$this变量的最好方法是在不同的上下文中尝试使用解释器：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1223399|print+isset($this);++++++++++++++//true,+++$this+exists
print+gettype($this);++++++++++++//Object,+$this+is+an+object+
print+is_array($this);+++++++++++//false,++$this+isn't+an+array
print+get_object_vars($this);++++//true,+++$this's+variables+are+an+array
print+is_object($this);++++++++++//true,+++$this+is+still+an+object
print+get_class($this);++++++++++//YourProject\YourFile\YourClass
print+get_parent_class($this);+++//YourBundle\YourStuff\YourParentClass
print+gettype($this->container);+//object
print_r($this);++++++++++++++++++//delicious+data+dump+of+$this
print+$this->yourvariable++++++++//access+$this+variable+with+->|code-block|syntax|javascript|1223400|因此，$this伪变量具有当前对象的方法和属性。这样的东西很有用，因为它允许您访问类中的所有成员变量和成员方法。例如：|1223401|Class+Dog{
++++public+$my_member_variable;+++++++++++++++++++++++++++++//member+variable

++++function+normal_method_inside_Dog()+{+++++++++++++++++++//member+method

++++++++//Assign+data+to+member+variable+from+inside+the+member+method
++++++++$this->my_member_variable+=+"whatever";

++++++++//Get+data+from+member+variable+from+inside+the+member+method.
++++++++print+$this->my_member_variable;
++++}
}|1223402|$this是对解释器为您创建的Object的引用，其中包含一个变量数组。|1223403|如果在普通类的普通方法内调用$this，$this将返回该方法所属的对象(类)。|1223404|如果上下文没有父对象，则$this可能是未定义的。|1223405|php.net有一个很大的页面，讨论了面向对象编程以及$this如何根据上下文运行。https://www.php.net/manual/en/language.oop5.basic.php|1223406|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/language.oop5.basic.php^0|8|5|0|0|3|5|0|0|0|5|F|6|0|E|5|K|5|0|C|5|0|R|5|16|1H|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|1P|8|@$9|1Q|A|1R|B|C]]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|W|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]]]

<h2>The best way to learn about the <code>$this</code> variable in PHP is to try it against the interpreter in various contexts:</h2>

<pre><code>print isset($this); //true, $this exists
print gettype($this); //Object, $this is an object 
print is_array($this); //false, $this isn't an array
print get_object_vars($this); //true, $this's variables are an array
print is_object($this); //true, $this is still an object
print get_class($this); //YourProject\YourFile\YourClass
print get_parent_class($this); //YourBundle\YourStuff\YourParentClass
print gettype($this-&gt;container); //object
print_r($this); //delicious data dump of $this
print $this-&gt;yourvariable //access $this variable with -&gt;
</code></pre>

So the <code>$this</code> pseudo-variable has the Current Object's method's and properties. Such a thing is useful because it lets you access all member variables and member methods inside the class. For example:

<pre><code>Class Dog{
 public $my_member_variable; //member variable

 function normal_method_inside_Dog() { //member method

 //Assign data to member variable from inside the member method
 $this-&gt;my_member_variable = "whatever";

 //Get data from member variable from inside the member method.
 print $this-&gt;my_member_variable;
 }
}
</code></pre>

<code>$this</code> is reference to a PHP <code>Object</code> that was created by the interpreter for you, that contains an array of variables.

If you call <code>$this</code> inside a normal method in a normal class, <code>$this</code> returns the Object (the class) to which that method belongs. 

It's possible for <code>$this</code> to be undefined if the context has no parent Object. 

php.net has a big page talking about PHP object oriented programming and how <code>$this</code> behaves depending on context. 
 <a href="https://www.php.net/manual/en/language.oop5.basic.php" rel="noreferrer">https://www.php.net/manual/en/language.oop5.basic.php</a>

blocks|key|1438266|text|$this为a+reference+to+the+calling+object+(通常是该方法所属的对象，但也可能是另一个对象，如果该方法是从辅助对象的上下文中静态调用的)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1438267|entityMap|0|LINK|mutability|MUTABLE|url|http://nl3.php.net/manual/en/language.oop5.basic.php^0|0|5|6|X|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<code>$this</code> is <a href="http://nl3.php.net/manual/en/language.oop5.basic.php" rel="nofollow noreferrer">a reference to the calling object</a> (usually the object to which the method belongs, but possibly another object, if the method is called statically from the context of a secondary object).

blocks|key|1438368|text|$this是一个特殊的变量，它引用同一个对象，即。它本身。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1438369|它实际上引用当前类实例|1438370|下面是一个示例，它将清除上面的语句|1438371|<?php
+class+Books+{
++/*+Member+variables+*/
++var+$price;
++var+$title;

++/*+Member+functions+*/
++function+setPrice($par){
+++++$this->price+=+$par;
++}

++function+getPrice(){
+++++echo+$this->price+." ";
++}

++function+setTitle($par){
+++++$this->title+=+$par;
++}

++function+getTitle(){
+++++echo+$this->title+."+ ";
++}
}
?>+|code-block|syntax|javascript|1438372|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|$]]

$this is a special variable and it refers to the same object ie. itself.

it actually refer instance of current class

here is an example which will clear the above statement

<pre><code>&lt;?php
 class Books {
 /* Member variables */
 var $price;
 var $title;

 /* Member functions */
 function setPrice($par){
 $this-&gt;price = $par;
 }

 function getPrice(){
 echo $this-&gt;price ."&lt;br/&gt;";
 }

 function setTitle($par){
 $this-&gt;title = $par;
 }

 function getTitle(){
 echo $this-&gt;title ." &lt;br/&gt;";
 }
}
?&gt; 
</code></pre>

blocks|key|1438444|text|让我们看看如果我们不使用$this并尝试使用以下代码片段使用相同名称的实例变量和构造函数参数，会发生什么情况|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1438445|<?php

class+Student+{
++++public+$name;

++++function+__construct(+$name+)+{
++++++++$name+=+$name;
++++}
};

$tom+=+new+Student('Tom');
echo+$tom->name;

?>|code-block|syntax|javascript|1438446|它回响的只有|1438447|<?php

class+Student+{
++++public+$name;

++++function+__construct(+$name+)+{
++++++++$this->name+=+$name;+//+Using+'this'+to+access+the+student's+name
++++}
};

$tom+=+new+Student('Tom');
echo+$tom->name;

?>|1438448|这是对“Tom”的回应。|1438449|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|$]]

Lets see what happens if we won't use $this and try to have instance variables and 
constructor arguments with the same name with the following code snippet

<pre><code>&lt;?php

class Student {
 public $name;

 function __construct( $name ) {
 $name = $name;
 }
};

$tom = new Student('Tom');
echo $tom-&gt;name;

?&gt;
</code></pre>

It echos nothing but 

<pre><code>&lt;?php

class Student {
 public $name;

 function __construct( $name ) {
 $this-&gt;name = $name; // Using 'this' to access the student's name
 }
};

$tom = new Student('Tom');
echo $tom-&gt;name;

?&gt;
</code></pre>

this echoes 'Tom'

blocks|key|1438525|text|这是很长很详细的解释。我希望这能对初学者有所帮助。我会让它变得非常简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1438526|首先，让我们创建一个类|1438527|<?php+

class+Class1
{
++++
}|code-block|syntax|javascript|1438528|如果你只使用php代码，你可以忽略php结束标签?>。|offset|length|style|CODE|1438529|现在，让我们在Class1中添加属性和方法。|1438530|<?php+

class+Class1
{
++++public+$property1+=+"I+am+property+1";
++++public+$property2+=+"I+am+property+2";

++++public+function+Method1()
++++{
++++++++return+"I+am+Method+1";
++++}
}|1438531|该属性只是一个简单的变量，但我们将其命名为property，因为它位于一个类中。|1438532|该方法只是一个简单的函数，但我们称其为方法，因为它也在类中。|1438533|public关键字表示可以在脚本中的任何位置访问方法或属性。|1438534|现在，我们如何使用Class1中的属性和方法呢？|1438535|答案是创建一个实例或对象，将对象视为类的副本。|1438536|<?php+

class+Class1
{
++++public+$property1+=+"I+am+property+1";
++++public+$property2+=+"I+am+property+2";

++++public+function+Method1()
++++{
++++++++return+"I+am+Method+1";
++++}
}

$object1+=+new+Class1;
var_dump($object1);|1438537|我们创建了一个对象，名为$object1，它是Class1及其所有内容的副本。我们使用var_dump()转储了$object1的所有内容。|1438538|这将会给你|1438539|object(Class1)#1+(2)+{+["property1"]=>+string(15)+"I+am+property+1"+["property2"]=>+string(15)+"I+am+property+2"+}|1438540|所以Class1的所有内容都在$object1中，除了Method1，我不知道为什么方法在转储对象时没有显示出来。|1438541|现在，如果我们只想访问$property1该怎么办。这很简单，我们做var_dump($object1->property1);，我们只是添加了->property1，我们指向它。|1438542|我们也可以访问Method1()，我们使用var_dump($object1->Method1());。|1438543|现在假设我想要从Method1()内部访问$property1，我将这样做|1438544|<?php+

class+Class1
{
++++public+$property1+=+"I+am+property+1";
++++public+$property2+=+"I+am+property+2";

++++public+function+Method1()
++++{+++
++++++++$object2+=+new+Class1;
++++++++return+$object2->property1;
++++}
}

$object1+=+new+Class1;
var_dump($object1->Method1());+|1438545|我们创建了$object2+=+new+Class1;，它是Class1的新副本，或者我们可以说是一个实例。然后我们从$object2指向property1|1438546|return+$object2->property1;|1438547|这将在浏览器中打印string(15)+"I+am+property+1"。|1438548|现在，不是在Method1()中执行此操作|1438549|$object2+=+new+Class1;
return+$object2->property1;|1438550|我们这样做|1438551|return+$this->property1;|1438552|在类内部使用$this对象来引用类本身。|1438553|它是创建新对象然后返回它的另一种方法，如下所示|1438554|$object2+=+new+Class1;
return+$object2->property1;|1438555|另一个例子|1438556|<?php+

class+Class1
{
++++public+$property1+=+119;
++++public+$property2+=+666;
++++public+$result;

++++public+function+Method1()
++++{+++
++++++++$this->result+=+$this->property1+%2B+$this->property2;
++++++++return+$this->result;
++++}
}

$object1+=+new+Class1;
var_dump($object1->Method1());|1438557|我们创建了两个包含整数的属性，然后将它们相加，并将结果放入$this->result。|1438558|不要忘记这一点|1438559|$this->property1+=+$property1+=+119|1438560|它们具有相同的值..等|1438561|我希望这能解释这个想法。|1438562|这一系列视频将在面向对象编程方面对您有很大帮助。|1438563|https://www.youtube.com/playlist?list=PLe30vg_FG4OSEHH6bRF8FrA7wmoAMUZLv|1438564|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|O|2|0|7|6|0|0|0|0|0|6|0|9|6|0|0|0|C|8|N|6|17|A|1K|8|0|0|0|2|6|F|8|R|7|0|B|A|Y|U|20|B|0|7|9|L|U|0|8|9|L|A|0|0|5|M|U|6|1N|8|1X|9|0|0|9|S|0|6|9|0|0|0|0|6|5|0|0|0|0|0|T|D|0|0|0|G|J|A|W|3|0|0|0|0|0|20|0|0^^$0|@$1|2|3|4|5|6|7|2T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|2U|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|2V|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|2W|8|@$K|2X|L|2Y|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|2Z|8|@$K|30|L|31|M|N]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|32|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|33|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|34|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|35|8|@$K|36|L|37|M|N]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|38|8|@$K|39|L|3A|M|N]]|9|@]|A|$]]|$1|10|3|11|5|6|7|3B|8|@]|9|@]|A|$]]|$1|12|3|13|5|F|7|3C|8|@]|9|@]|A|$G|H]]|$1|14|3|15|5|6|7|3D|8|@$K|3E|L|3F|M|N]|$K|3G|L|3H|M|N]|$K|3I|L|3J|M|N]|$K|3K|L|3L|M|N]]|9|@]|A|$]]|$1|16|3|17|5|6|7|3M|8|@]|9|@]|A|$]]|$1|18|3|19|5|F|7|3N|8|@]|9|@]|A|$G|H]]|$1|1A|3|1B|5|6|7|3O|8|@$K|3P|L|3Q|M|N]|$K|3R|L|3S|M|N]|$K|3T|L|3U|M|N]]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|3V|8|@$K|3W|L|3X|M|N]|$K|3Y|L|3Z|M|N]|$K|40|L|41|M|N]]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|42|8|@$K|43|L|44|M|N]|$K|45|L|46|M|N]]|9|@]|A|$]]|$1|1G|3|1H|5|6|7|47|8|@$K|48|L|49|M|N]|$K|4A|L|4B|M|N]]|9|@]|A|$]]|$1|1I|3|1J|5|F|7|4C|8|@]|9|@]|A|$G|H]]|$1|1K|3|1L|5|6|7|4D|8|@$K|4E|L|4F|M|N]|$K|4G|L|4H|M|N]|$K|4I|L|4J|M|N]|$K|4K|L|4L|M|N]]|9|@]|A|$]]|$1|1M|3|1N|5|F|7|4M|8|@]|9|@]|A|$G|H]]|$1|1O|3|1P|5|6|7|4N|8|@$K|4O|L|4P|M|N]]|9|@]|A|$]]|$1|1Q|3|1R|5|6|7|4Q|8|@$K|4R|L|4S|M|N]]|9|@]|A|$]]|$1|1S|3|1T|5|F|7|4T|8|@]|9|@]|A|$G|H]]|$1|1U|3|1V|5|6|7|4U|8|@]|9|@]|A|$]]|$1|1W|3|1X|5|F|7|4V|8|@]|9|@]|A|$G|H]]|$1|1Y|3|1Z|5|6|7|4W|8|@$K|4X|L|4Y|M|N]]|9|@]|A|$]]|$1|20|3|21|5|6|7|4Z|8|@]|9|@]|A|$]]|$1|22|3|23|5|F|7|50|8|@]|9|@]|A|$G|H]]|$1|24|3|25|5|6|7|51|8|@]|9|@]|A|$]]|$1|26|3|27|5|F|7|52|8|@]|9|@]|A|$G|H]]|$1|28|3|29|5|6|7|53|8|@$K|54|L|55|M|N]]|9|@]|A|$]]|$1|2A|3|2B|5|6|7|56|8|@]|9|@]|A|$]]|$1|2C|3|2D|5|6|7|57|8|@$K|58|L|59|M|N]|$K|5A|L|5B|M|N]|$K|5C|L|5D|M|N]]|9|@]|A|$]]|$1|2E|3|2F|5|6|7|5E|8|@]|9|@]|A|$]]|$1|2G|3|2H|5|6|7|5F|8|@]|9|@]|A|$]]|$1|2I|3|2J|5|6|7|5G|8|@]|9|@]|A|$]]|$1|2K|3|2L|5|6|7|5H|8|@]|9|@$K|5I|L|5J|1|5K]]|A|$]]|$1|2M|3|-4|5|6|7|5L|8|@]|9|@]|A|$]]]|2N|$2O|$5|2P|2Q|2R|A|$2S|2L]]]]

This is long detailed explanation. I hope this will help the beginners. I will make it very simple.
First, let's create a class
<pre><code>&lt;?php 

class Class1
{
 
}
</code></pre>
You can omit the php closing tag <code>?&gt;</code> if you are using php code only.
Now let's add properties and a method inside <code>Class1</code>.
<pre><code>&lt;?php 

class Class1
{
 public $property1 = &quot;I am property 1&quot;;
 public $property2 = &quot;I am property 2&quot;;

 public function Method1()
 {
 return &quot;I am Method 1&quot;;
 }
}
</code></pre>
The property is just a simple variable , but we give it the name property cuz its inside a class.
The method is just a simple function , but we say method cuz its also inside a class.
The <code>public</code> keyword mean that the method or a property can be accessed anywhere in the script.
Now, how we can use the properties and the method inside <code>Class1</code> ?
The answer is creating an instance or an object, think of an object as a copy of the class.
<pre><code>&lt;?php 

class Class1
{
 public $property1 = &quot;I am property 1&quot;;
 public $property2 = &quot;I am property 2&quot;;

 public function Method1()
 {
 return &quot;I am Method 1&quot;;
 }
}

$object1 = new Class1;
var_dump($object1);
</code></pre>
We created an object, which is <code>$object1</code> , which is a copy of <code>Class1</code> with all its contents. And we dumped all the contents of <code>$object1</code> using <code>var_dump()</code> .
This will give you
<pre><code>object(Class1)#1 (2) { [&quot;property1&quot;]=&gt; string(15) &quot;I am property 1&quot; [&quot;property2&quot;]=&gt; string(15) &quot;I am property 2&quot; }
</code></pre>
So all the contents of <code>Class1</code> are in <code>$object1</code> , except <code>Method1</code> , i don't know why methods doesn't show while dumping objects.
Now what if we want to access <code>$property1</code> only. Its simple , we do <code>var_dump($object1-&gt;property1);</code> , we just added <code>-&gt;property1</code> , we pointed to it.
we can also access <code>Method1()</code> , we do <code>var_dump($object1-&gt;Method1());</code>.
Now suppose i want to access <code>$property1</code> from inside <code>Method1()</code> , i will do this
<pre><code>&lt;?php 

class Class1
{
 public $property1 = &quot;I am property 1&quot;;
 public $property2 = &quot;I am property 2&quot;;

 public function Method1()
 { 
 $object2 = new Class1;
 return $object2-&gt;property1;
 }
}

$object1 = new Class1;
var_dump($object1-&gt;Method1()); 
</code></pre>
we created <code>$object2 = new Class1;</code> which is a new copy of <code>Class1</code> or we can say an instance. Then we pointed to <code>property1</code> from <code>$object2</code>
<pre><code>return $object2-&gt;property1;
</code></pre>
This will print <code>string(15) &quot;I am property 1&quot;</code> in the browser.
Now instead of doing this inside <code>Method1()</code>
<pre><code>$object2 = new Class1;
return $object2-&gt;property1;
</code></pre>
We do this
<pre><code>return $this-&gt;property1;
</code></pre>
The <code>$this</code> object is used inside the class to refer to the class itself.
It is an alternative for creating new object and then returning it like this
<pre><code>$object2 = new Class1;
return $object2-&gt;property1;
</code></pre>
Another example
<pre><code>&lt;?php 

class Class1
{
 public $property1 = 119;
 public $property2 = 666;
 public $result;

 public function Method1()
 { 
 $this-&gt;result = $this-&gt;property1 + $this-&gt;property2;
 return $this-&gt;result;
 }
}

$object1 = new Class1;
var_dump($object1-&gt;Method1());
</code></pre>
We created 2 properties containing integers and then we added them and put the result in <code>$this-&gt;result</code>.
Do not forget that
<code>$this-&gt;property1</code> = <code>$property1</code> = <code>119</code>
they have that same value .. etc
I hope that explains the idea.
This series of videos will help you a lot in OOP
<a href="https://www.youtube.com/playlist?list=PLe30vg_FG4OSEHH6bRF8FrA7wmoAMUZLv" rel="nofollow noreferrer">https://www.youtube.com/playlist?list=PLe30vg_FG4OSEHH6bRF8FrA7wmoAMUZLv</a>

I see the variable <code>$this</code> in PHP all the time and I have no idea what it's used for. I've never personally used it. 

Can someone tell me how the variable <code>$this</code> works in PHP?

What does the variable $this mean in PHP?

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PHP语言

我在PHP中经常看到变量$this，我不知道它是用来做什么的。我从来没有亲自使用过它。谁能告诉我在PHP中变量$this是如何工作的？

问变量$this在PHP中是什么意思？
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