php類的單繼承性,無法同時從兩個基類中繼承屬性和方法,為了解決這個問題,使用Trait特性解決.
用法：通過在類中使用use 關鍵字,聲明要組合的Trait名稱,具體的Trait的聲明使用Trait關鍵詞. 註意:Trait不能實例化

demo示例:

 1 <?php
 2 trait Dog{
 3     public function dog(){
 4     echo ‘This trair dog‘;
 5     }
 6 }
 7 
 8 trait Fish{
 9     public function fish(){
10     echo
 
 ‘This trair fish‘;
11     }
12 }
13 
14 
15 class Animal{
16     public function name(){
17         echo ‘This is animal‘;
18     }
19 }
20 
21 class Cat extends Animal{
22     use Dog,Fish;
23     public function eat(){
24         echo ‘This is animal cat eat‘;
25     }
26 }
27 
28
 
 $data = new Cat();
29 $data->name();//This is animal
30 echo ‘<pre>‘;
31 $data->eat();//This is animal cat eat
32 echo ‘<pre>‘;
33 $data->dog();//This trair dog
34 echo ‘<pre>‘;
35 $data->fish();//This trair fish

結果打印:

PHP Trait特性