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0808作业 回调函数和递归函数
︷肉園耔︷
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628 people have browsed it
  1. <!doctype html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport"
  6.           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  7.     <meta http-equiv="X-UA-Compatible" content="ie=edge">
  8.     <title>Document</title>
  9. </head>
  10. <body>
  11. <form  method="post">
  12.     <input type="text" name="first" />
  13.     <select name="s" id="">
  14.         <option value="+">+</option>
  15.         <option value="-">-</option>
  16.         <option value="*">*</option>
  17.         <option value="%">%</option>
  18.         <option value="/">/</option>
  19.     </select>
  20.     <input type="text" name="second">
  21.     <input type="submit" value="结果">
  22. </form>
  25. </body>
  26. </html>
  28. <?php
  29. //判断是否PHP的得到值
  30. $first=$_POST["first"];  //获得name为first的值
  31. $v=$_POST["s"];        //获取name为s的值
  32. $second=$_POST["second"];   //获取name为second的值
  33. if($v=="+"){
  34.     echo $first."+".$second."结果为".($first+$second);
  35. }elseif($v== "-"){
  36.     echo $first."-".$second."结果为".($first-$second);
  37. }elseif($v== "*"){
  38.     echo $first."*".$second."结果为".($first-$second);
  39. }elseif($v=="/"){
  40.     if($second ==0){
  41.     echo "除数不能为0";
  42.     }else{
  43.         echo $first."/".$second."结果为".($first/$second);
  44.     }
  45. }elseif($v == "%"){
  46.      if($second ==0){
  47.          echo "除数不能为0";
  48.      }else{
  49.          echo $first."%".$second."结果为".($first%$second);
  50.      }
  51. }
  55. function demo(string $name):string{
  56.     return '你好'.$name;
  57. }
  59. //demo('灭绝师太');
  61.  echo  call_user_func('demo','灭绝老师');
  62.  echo  call_user_func_array('demo',['朱老师']);
  64. //递归函数  函数自身调用自身，但必须在调用自身前有条件判断，否则无限调用下去
  65.  //声明缓存目录
  66. ob_clean();
  68. function del($dir){
  69.     if(is_dir($dir)){
  70.         //成功打开目录流
  71.       if($handle  = opendir($dir)){
  72.           while(($file=readdir($handle))
  73.           !==false){
  74.            if($file !='.'&& $file !='..'){
  75.                if(is_dir($dir.'\\'.$file)){
  76.                    delete_dir_file($dir.'\\'.file);
  77.                }else{
  78.                    unlink($dir.'\\'.$file);
  79.                }
  80.            }
  81.           }
  82.       }
  83.       closedir($handle);
  84.     }
  85. }
  86. $path = __DIR__;
  87. del($path);
  88. ?>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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