本文实例讲述了php trait功能与用法。分享给大家供大家参考，具体如下：
trait 是为类似 php 的单继承语言而准备的一种代码复用机制。
1.如果引入的trait有同名的方法trait a{ public function eat(){ echo 'a-eat'; } public function say(){ echo 'a-say'; }} trait b{ public function eat(){ echo 'b-eat'; } public function say(){ echo 'b-say'; }} class people{ use a,b{ a::eat insteadof b; b::eat as eatbak; b::say insteadof a; }} $people = new people();$people->eat();echo "<br/>";$people->say();echo "<br/>";$people->eatbak();
运行结果：
a-eat
b-say
b-eat
2.修改访问控制<?phptrait test { public function say() { echo 'say hello'; }} class people { use test { say as protected; }} $people = new people(); $people->say();
运行结果：
fatal error: call to protected method people::say() from context '' in d:\phpdemo\trait_demo.php on line 14
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以上就是php之trait功能与用法实例分析的详细内容。