PHP: Example code sharing of range parsing operator (::)

Scope parsingThe operator (::) is a pair of colons that can be used to access static members, methods and constants , as well as members and methods in the overridden class.

When using the :: notation outside a class to access these static members, methods, and constants, the name of the class must be used, as shown in the following example.

:: Example of accessing static members and methods

<?php
Class Person{
    // 定义静态成员属性
    public static $country = "中国";
    // 定义静态成员方法
    public static function myCountry() {
        //内部访问静态成员属性
        echo "我是".self::$country."人<br />";
    }
}

// 输出静态成员属性值
echo Person::$country."<br />";
// 访问静态方法
Person::myCountry();
?>

Use the :: symbol to access static members and methods. For more information, please refer to "PHP Static (static)".

:: Example of accessing members and methods covered by the parent class

class Person {
    var $name;
    var $sex;
    var $age;

    function say() {
        echo "我的名字叫：".$this->name."<br />";
	echo "性别：".$this->sex."<br />";
	echo "我的年龄是：".$this->age;
    }
}
class Student extends Person {
    var $school;
	
    function say() {
        parent::say();
        echo "我在".$this->school."上学";
    }
}

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