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变量与函数的声明,使用与参数实例
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变量与函数的声明,使用与参数实例

代码

  1. <?php
  2. //变量与函数
  3. //变量声明
  4. $username = "小刘同学";
  5. //打印
  6. echo $username;
  7. //函数声明
  8. function getUsername(string $username):string
  9. {
  10. return '你好, '. $username;
  11. }
  12. //调用
  13. echo getUsername('李同学');
  14. //参数不足 ,默认值
  15. function getTotal(float $price,int $num = 1):float
  16. {
  17. return $price * $num;
  18. }
  19. echo '总金额:'.getTotal(55.5,5).' 元';
  20. //参数过多 剩余参数 ...rest
  21. $sum = function(float $a,float $b,float $c):float
  22. {
  23. return $a + $b +$c;
  24. };
  25. $sum = function(...$args){
  26. return array_reduce($args,function($acc,$cur){
  27. return $acc + $cur;
  28. });
  29. };
  30. echo $sum(3,4,5,6,7);
  31. //返回值
  32. // 默认返回单值:return
  33. // 返回多值:数组/对象
  34. $arr = [33,3,55,5,15,59,100];
  35. // 在php回调方法中,使用外部变量,用use进行声明
  36. function getItems(array $arr,$value):array
  37. {
  38. return array_filter($arr,function($item) use ($value){
  39. return $item>$value;
  40. });
  41. }
  42. print_r(getItems($arr,22));
Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:
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