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include和require的区别 实例演示:类与对象关键字 魔术方法
早晨
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include和require的区别

加载失败的处理方式不同
includerequire除了在处理引入文件的方式不同外,最大的区别就是:
include在引入不存在文件时产生一个警告且脚本还会继续执行,
require则会导致一个致命性错误且脚本停止执行。
例如:

  1. <?php
  2. include 'xxxx.php';
  3. echo 'hello';
  4. ?>

如果xxxx.php不存在,echo ‘world’这句是可以继续执行的。

  1. <?php
  2. require 'xxxx.php';
  3. echo 'hello';
  4. ?>

如果xxxx.php不存在,echo ‘hello’这句是不会执行的,到require时就停止了。

实例演示:类与对象关键字 魔术方法

  1. <?php
  2. namespace _0812;
  3. class Ab
  4. {
  5. public $name; //公有成员
  6. private $age = 25; //私有成员
  7. static $tel; // 静态成员
  8. public function __construct($name, $tel = '13000000000')
  9. {
  10. $this->name = $name;
  11. self::$tel = $tel;
  12. }
  13. }
  14. $abc = new Ab('早晨', '13000008888');
  15. echo '公有成员:' . $abc->name . '<br>';
  16. echo '静态成员:' . Ab::$tel . '<br>';
  17. // 私有成员赋值
  18. @$ages->age = 35;
  19. echo '私有成员:' . $ages->age . '<br>';
  20. echo '<hr>';
  21. class Cd
  22. {
  23. private $age = 30;
  24. public function __get($ages)
  25. {
  26. if ($ages === 'age') {
  27. return $this->$ages + 5;
  28. }
  29. }
  30. public function __set($ages, $value)
  31. {
  32. if ($ages === 'age') {
  33. if ($value >= 18 && $value <= 35) {
  34. $this->$ages = $value;
  35. } else {
  36. echo '您超过年龄了!';
  37. }
  38. }
  39. }
  40. }
  41. $user = new Cd();
  42. echo $user->age . '<br>';
  43. $user->age = 40;

运行效果

Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:
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