trait,代码复用—2018年5月8日09:09:02

实例

<?php
//声明父类: Person
if (!class_exists('Person')) {
    class Person
    {
        protected $name;
        public function __construct($name='郭德纲')
        {
            $this->name = $name;
        }
        public function study($course='喝红酒')
        {
            return $this->name.'的爱好'.$course;
        }
    }
}
if(!trait_exists('Course')){
    trait Course
    {
        public $friend='于谦';
        public function sport($name='吹牛皮')
        {
            return $this->name.'和'.$this->friend.'的爱好'.$name;
        }
        abstract public static function hobby($name);
        public function study($course='装孙子')
        {
            return $this->name.'的爱好'.$course;
        }
    }
}
if(!trait_exists('Recreation')){
    trait Recreation
    {

        public $friend1='郭麒麟';
        public function sport($name='赌博')
        {
            return $this->name.'和'.$this->friend1.'的爱好'.$name;
        }
    }
}
class Student extends Person
{
    use Course, Recreation {
        Course::sport insteadof Recreation;
        Recreation::sport as mySport;
    }
    public static function hobby($name)
    {
        return $name;
    }

    public function study($course='python')
    {
        return $this->name.'的爱好'.$course;
    }
}
//实例化Student类
$student = new Student();
echo '<hr>';
//1.访问父类Person中的方法
//echo $student->study();
echo Student::hobby('抽烟喝酒烫头');
echo '<hr>';
echo $student->sport();
echo '<hr>';
echo $student->mySport();