Things to note about PHP properties and methods

The content of this article is about the points to note about PHP attributes and methods. It has certain reference value. Now I share it with you. Friends in need can refer to it

/*
1. Regarding the attribute value, you can declare the attribute and assign a value, or you can declare the attribute without assigning a value first
If you do not assign a value, the initial value of the attribute is null

2. For classes in PHP, the attribute must be a "direct Value"
is any "value" of the 8 types

cannot be: the value of expression 1 2
cannot be: the return value of the function time();

* /

class Human {
    public $age = 0;
}$a = new Human();echo $a->age,&#39;<br >&#39;;

class People {
    public $age;
}$b = new People();
var_dump($b->age);echo &#39;<br >&#39;;

//类中可以重名class clock {
    public function time() {
        echo '现在的时间戳是aaaa';
    }    public function t() {
        return '内部的t';
    }    public function time2() {
        echo &#39;现在的真正时间戳是&#39;,time(),&#39;<br >&#39;;        // 注意：此处调用的是系统的time()函数
        echo $this->t(); 
        // 注意：此处调用的是自身的t函数
    }
}$c = new clock();$c->time();echo &#39;<br >&#39;;$c->time2();

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