我们在哪里使用 PHP 中的对象运算符“->”？
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Where do we use the object operator "->" in PHP?
提问by nectar
What are the different ways where we can use object operators ->in PHP?
我们可以->在 PHP 中使用对象运算符的不同方式有哪些？
回答by Powerlord
PHP has two object operators.
PHP 有两个对象操作符。
The first, ->, is used when you want to call a method on an instance or access an instance property.
第一个 ,->用于在实例上调用方法或访问实例属性。
The second, ::, is used when you want to call a staticmethod, access a staticvariable, or call a parent class's version of a method within a child class.
回答by Mark Baker
When accessing a method or a property of an instantiated class
访问实例化类的方法或属性时
class SimpleClass
{
// property declaration
public $var = 'a default value';
// method declaration
public function displayVar() {
echo $this->var;
}
}
$a = new SimpleClass();
echo $a->var;
$a->displayVar();
回答by mmattax
Call a function:
调用函数：
$foo->bar();
Access a property:
访问属性：
$foo->bar = 'baz';
where $foois an instantiated object.
哪里$foo是一个实例化的对象。
回答by Wind Chimez
It is used when referring to the attributes of an instantiated object. e.g:
它在引用实例化对象的属性时使用。例如：
class a {
public $yourVariable = 'Hello world!';
public function returnString() {
return $this->yourVariable;
}
}
$object = new a();
echo $object->returnString();
exit();
