php里面traits技术上部(系列篇）-CFANZ编程社区

<?php
header('Content-Type:text/html;charset=utf-8');
trait tA
{
  public function aa()
  {
    echo "<p>aaa....</p>";
  }
  public function bb(){
    echo "<p>bb...</p>";
  }
}
abstract class Humanity
{
  public $name;
  public $sex;
  public $iq=10;
  const BIRTHPLACE="地球";
  static public $counter=0;
  public function __construct($name,$sex)
  {
    self::$counter++;
    $this->name=name;
    $this->sex=$sex;
  }
  protected function chew($food)
  {
    echo "<p>{$food}已经被咀嚼完成！</p>";
  }
  abstract public function eat($food);
  static public function hello()
  {
    echo '<p>您好！我是来自'.self::BIRTHPLACE.'的人类</p>';
  }

} 
class Student extends Humanity
{
  const BIRTHPLACE='火星';
  public $studentId;
  public function test($subject)
  {
echo "<p>{$this->name}正在考{$subject}！</p>";
  }
  public function eat($food)
  {
      $this->chew($food);
      echo "<p>{$this->name}正在快速的吃{$food}！</p>";
  }
  use tA;//相当于
  /*public function aa()
  {
    echo "<p>aaa....</p>";
  }
  public function bb(){
    echo "<p>bb...</p>";
  }*/
}
abstract class Dog
{

}
class  huskies extends Dog
{
  use tA;
  //相当于
  /*public function aa()
  {
    echo "<p>aaa....</p>";
  }
  public function bb(){
    echo "<p>bb...</p>";
  }*/
}
$hanMM=new Student('韩梅梅','女');
$hanMM->aa();
$wW=new  Huskies();
$wW->bb();

解析：

use tA;相当于

public function aa()
  {
    echo "<p>aaa....</p>";
  }
  public function bb(){
    echo "<p>bb...</p>";
  }

traits技术的基本使用技巧是：他是作用的引入一段《《《代码》》》。

效果图：

php里面traits技术上部(系列篇）_开发语言

优先级：

<?php
header('Content-Type:text/html;charset=utf-8');
//traits优先级
trait tA {
  public function aa(){
    echo "<p>tA:aa...</p>";
  }
  public function bb(){
    echo "<p>tA:bb...</p>";
  }
}
//抽象类
abstract class Humanity {
  public $name;
  public $sex;
  public $iq=10;
  const BIRTHPLACE='地球';
  static public $counter=0;//静态属性，它是公共的资源和具体的实例没有关系
  //构造函数
  public function __construct($name,$sex){
    self::$counter++;
    $this->name=$name;
    $this->sex=$sex;
  }
  protected function chew($food){
    echo "<p>{$food}已经被咀嚼完成！</p>";
  }
  //抽象方法
  abstract public function eat($food);
  static public function hello(){
    echo '<p>您好！我是来自'.self::BIRTHPLACE.'的人类</p>';
  }
  public function aa(){
    echo "<p>Humanity:aa...</p>";
  }
}
class Student extends Humanity {
  const BIRTHPLACE='火星';
  public $studentId;
  public function test($subject){
    echo "<p>{$this->name}正在考{$subject}！</p>";
  }
  public function eat($food){
    $this->chew($food);
    echo "<p>{$this->name}正在快速的吃{$food}！</p>";
  }
  public function aa(){
    echo "<p>Student:aa...</p>";
  }
  use tA;
}
abstract class Dog {

}
class Huskies extends Dog {
  use tA;
}
$hanMM=new Student('韩梅梅','女');
$hanMM->aa();

解析：

本类定义的优先级比语法糖traits定义的优先级高，为什么呢？

因为有一定的层级关系：

父类里面的同名方法<traits里面的同名方法<本类里面的同名方法

一个文件定义多个语法糖：

<?php
header('Content-Type:text/html;charset=utf-8');
//traits优先级
trait tA {
  public function aa(){
    echo "<p>tA:aa...</p>";
  }
  public function bb(){
    echo "<p>tA:bb...</p>";
  }
}
trait tB
{
  public function cc(){
    echo "<p>tB:cc...</p>";
  }
  public function dd(){
    echo "<p>tB:dd...</p>";
  }
}
//抽象类
abstract class Humanity {
  public $name;
  public $sex;
  public $iq=10;
  const BIRTHPLACE='地球';
  static public $counter=0;//静态属性，它是公共的资源和具体的实例没有关系
  //构造函数
  public function __construct($name,$sex){
    self::$counter++;
    $this->name=$name;
    $this->sex=$sex;
  }
  protected function chew($food){
    echo "<p>{$food}已经被咀嚼完成！</p>";
  }
  //抽象方法
  abstract public function eat($food);
  static public function hello(){
    echo '<p>您好！我是来自'.self::BIRTHPLACE.'的人类</p>';
  }
  public function aa(){
    echo "<p>Humanity:aa...</p>";
  }
}
class Student extends Humanity {
  const BIRTHPLACE='火星';
  public $studentId;
  public function test($subject){
    echo "<p>{$this->name}正在考{$subject}！</p>";
  }
  public function eat($food){
    $this->chew($food);
    echo "<p>{$this->name}正在快速的吃{$food}！</p>";
  }
  public function aa(){
    echo "<p>Student:aa...</p>";
  }
  use tA,tB;
}
abstract class Dog {

}
class Huskies extends Dog {
  use tA;
}
$hanMM=new Student('韩梅梅','女');
$hanMM->aa();

php里面traits技术上部(系列篇）_优先级_02

问题：
一次性使用多个trait，如果不提trait里面有同名的方法怎么解决这个冲突呢？

<?php
header('Content-Type:text/html;charset=utf-8');
//traits优先级
trait tA {
  public function aa(){
    echo "<p>tA:aa...</p>";
  }
  public function bb(){
    echo "<p>tA:bb...</p>";
  }
  public function ok(){
    echo "<p>tA:ok...</p>";
  }
}
trait tB {
  public function cc(){
    echo "<p>tB:cc...</p>";
  }
  public function dd(){
    echo "<p>tB:dd...</p>";
  }
  public function ok(){
    echo "<p>tB:ok...</p>";
  }
}
//抽象类
abstract class Humanity {
  public $name;
  public $sex;
  public $iq=10;
  const BIRTHPLACE='地球';
  static public $counter=0;//静态属性，它是公共的资源和具体的实例没有关系
  //构造函数
  public function __construct($name,$sex){
    self::$counter++;
    $this->name=$name;
    $this->sex=$sex;
  }
  protected function chew($food){
    echo "<p>{$food}已经被咀嚼完成！</p>";
  }
  //抽象方法
  abstract public function eat($food);
  static public function hello(){
    echo '<p>您好！我是来自'.self::BIRTHPLACE.'的人类</p>';
  }
  public function aa(){
    echo "<p>Humanity:aa...</p>";
  }
}
class Student extends Humanity {
  const BIRTHPLACE='火星';
  public $studentId;
  public function test($subject){
    echo "<p>{$this->name}正在考{$subject}！</p>";
  }
  public function eat($food){
    $this->chew($food);
    echo "<p>{$this->name}正在快速的吃{$food}！</p>";
  }
  public function aa(){
    echo "<p>Student:aa...</p>";
  }
  use tA,tB
  {
    tA::ok insteadof tB;
    tB::ok as okTb;
  }
}
abstract class Dog {

}
class Huskies extends Dog {
  use tA,tB
  {
    tB::ok insteadof tA;
  }
}
$hanMM=new Student('韩梅梅','女');
$hanMM->ok();
$hanMM->okTb();
$wW=new Huskies();
$wW->ok();

解析一：

use tA,tB
  {
    tA::ok insteadof tB;
    tB::ok as okTb;
  }

tA里面的ok方法替换掉tB里面的ok方法，tB里面的ok函数改成okTb函数

解析二：

use tA,tB
  {
    tB::ok insteadof tA;
  }

tB里面的ok方法替换掉tA里面的ok方法

php里面traits技术上部(系列篇）_开发语言_03