Mobile app interface programming technology - advanced PHP classes and objects for learning and implementation

• Create classes and objects

<code><span><span><?php</span><span><span>class</span><span>Car</span>
{</span><span>public</span><span>$name</span> = <span>'汽车'</span>;

   <span>public</span><span><span>function</span><span>getName</span><span>()</span>
   {</span><span>return</span><span>$this</span>->name;
   }
}

<span>$car</span> = <span>new</span> Car();

<span>echo</span><span>$car</span>->name.<span>'<br>'</span>;
<span>echo</span><span>$car</span>->getName();</span></span></code>

• Attributes of a class

The attribute declaration starts with the keywords public, protected or private, followed by an ordinary variable declaration. Attribute variables can be initialized with a default value, and the default value must be a constant.

The meaning of access control keywords is:
public: public
protected: protected
private: Private ones

are public by default and can be accessed by the outside world. Generally, the properties or methods of an object are accessed through the -> object operator. For static properties, use :: double colon to access them. When called inside a class member method, you can use the $this pseudo variable to call the properties of the current object.

Protected properties and private properties do not allow external calls, but can be called within the member methods of the class.

• Class methods

Like attributes, class methods also have public, protected and private access control.

Modified with the keyword static, it is called a static method. Static methods do not need to instantiate objects and can be called directly through the class name. The operator is a double colon::.

<code><span><span><?php</span><span><span>class</span><span>Car</span> {</span><span>public</span><span>$speed</span> = <span>0</span>;
    <span>//增加speedUp方法，使speed加10</span><span><span>function</span><span>speedUp</span><span>()</span>
    {</span><span>$this</span>->speed +=<span>10</span>;
    }

   <span>public</span><span>static</span><span>$name</span> = <span>'jarlen'</span>;

   <span>public</span><span>static</span><span><span>function</span><span>getSpeed</span><span>()</span>
   {</span><span>return</span><span>'ja'</span>;
   }

}
<span>$car</span> = <span>new</span> Car();
<span>$car</span>->speedUp();
<span>echo</span><span>$car</span>->speed;

<span>echo</span><span>'<br><br>'</span>.Car::<span>$name</span>.<span>'<br><br>'</span>;

<span>echo</span> Car::getSpeed();</span></span></code>

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