parent:: self:: static $this->php

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autumn 2023-05-16 17:06:55 博主文章分类：web

文章标签 php html HTML 文章分类 HarmonyOS 后端开发

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
  <head>
   <title>  parent3.php </title>
   <meta charset="UTF-8">
   <meta name="Author" content="">
   <meta name="Keywords" content="">
   <meta name="Description" content="">
  </head> <body>
  <?php
  class A {
   public static  $a="hello I am A<br>";
   function example() {
   echo "I am A::example()<br />";
   echo self::$a;
   }
  } class B extends A {
   function example() {
    echo "I am B::example()<br />";
    parent::example();
   }
  } $b = new B;
  // 这将调用 B::example()，而它会去调用 A::example()。
 $b->example();
 echo '<hr>';
 B::example();
  ?>
 <hr><hr><hr>
  <?php
  class AA {
   public static $a="hello I am AA<br>";
   function example() {
   echo "I am AA::example()<br />";
   echo self::$a;
   }
  } class BB extends AA {
   function example() {
    echo "I am BB::example()<br />";
    AA::example();
   }
  } $b = new BB;
  // 这将调用 B::example()，而它会去调用 A::example()。
 $b->example();
 echo '<hr>';
 BB::example();
  ?>
  </body>
 </html>

I am B::example()
I am A::example()
hello I am A

I am BB::example()
I am AA::example()
hello I am AA