访问PHP对象属性的语法是什么? [英] What is the syntax for accessing PHP object properties?

问题描述

如何访问PHP对象的属性?

此外，使用访问对象的属性有什么区别 $this->$property1与$this->property1?

Also, what is the difference between accessing an object's property with $this->$property1 vs. $this->property1?

当我尝试使用$this->$property1时，出现以下错误:

When I try to use $this->$property1 I get the following error:

"PHP:无法访问空属性".

'PHP: Cannot access empty property'.

PHP关于对象属性的文档有一条评论提到了这一点，但该评论并未真正深入解释.

PHP's documentation on object properties has one comment which mentions this, but the comment doesn't really explain in depth.

推荐答案

1. $property1//特定变量
2. $this->property1//特定属性

1. $property1 // specific variable
2. $this->property1 // specific attribute

在类上的一般用法是不使用"$"，否则您将调用一个名为$property1的变量，该变量可以具有任何值.

The general use on classes is without "$" otherwise you are calling a variable called $property1 that could take any value.

示例:

class X {
  public $property1 = 'Value 1';
  public $property2 = 'Value 2';
}
$property1 = 'property2';  //Name of attribute 2
$x_object = new X();
echo $x_object->property1; //Return 'Value 1'
echo $x_object->$property1; //Return 'Value 2'

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