Detailed explanation of PHP properties and method examples

This article mainly shares with you detailed explanations of PHP attributes and method examples, mainly in the form of text and code. I hope it can help everyone.

/*
1. Regarding attribute values, you can declare the attribute and assign a value, or you can declare the attribute without assigning a value first.
If no value is assigned, the initial value of the attribute is null

2 , the class in PHP, the attribute must be a "direct value"
is any "value" of 8 types

cannot be: the value of expression 1+2
cannot be: function The return value of 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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