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使用递归函数删除指定目录，字符串操作函数以及一些函数的使用
一个好人
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使用递归函数删除指定目录

成功删除0407目录

  1. if(!function_exists('delete_dir_file')){
  2.     function delete_dir_file($dir){
  3.         $flag = false;
  4.         if(is_dir($dir)){
  5.             if($handle = opendir($dir)){
  6.                 while(($file = readdir($handle)) !== false){
  7.                     // echo $file.'<br>';
  8.                     if($file !=='.'&&$file !=='..'){
  9.                         if(is_dir($dir.DIRECTORY_SEPARATOR.$file)){
  10.                             delete_dir_file($dir.DIRECTORY_SEPARATOR.$file);
  11.                         }else unlink($dir.DIRECTORY_SEPARATOR.$file);
  12.                     }
  13.                 }
  14.             }
  15.             closedir($handle);
  16.             if(rmdir($dir)) $flag = true;
  17.         }
  18.         return $flag;
  19.     }
  20. }
  21. $dir = __DIR__.DIRECTORY_SEPARATOR.'0407';
  22. // echo $dir;
  23. if(delete_dir_file($dir)){
  24.     echo json_encode(['msg'=>'删除成功','code'=>0],320);
  25. }else{
  26.     echo json_encode(['msg'=>'删除失败','code'=>1],320);

实现产品多级分类并在前端显示

  1. $db = new PDO('mysql:host=localhost;dbname=laravel','root','root');
  2. $RES = $db->query('select `id`,`pid`,`name` from `cates` where `status`=1;')->fetchAll(PDO::FETCH_ASSOC);
  3. printf('<pre>%s</pre>',print_r($RES,true));
  4. function ruleLayer($rule, $pid = 0){
  5.     $arr = [];
  6.     foreach($rule as $v){
  7.         if($v['pid']==$pid){
  8.             $v['child'] = ruleLayer($rule, $v['id']);
  9.             $arr[] = $v;
  10.         }
  11.     }
  12.     return $arr;
  13. }
  14. $result = ruleLayer($RES);
  15. printf('<pre>%s</pre>',print_r($result,true));
  16. ?>
  18. <!DOCTYPE html>
  19. <html lang="zh-CN">
  20. <head>
  21.     <meta charset="UTF-8">
  22.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  23.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  24.     <title>Document</title>
  25. </head>
  26. <body>
  27.     <ul class="first">
  28.         <?php foreach($result as $v): extract($v)?>
  29.         <li>
  30.             <?=$name?>
  31.             <ul>
  32.                 <?php if(!empty($child)):
  33.                     foreach($child as $v1): extract($v1)?>
  34.                     <li>
  35.                         <?=$name?>
  36.                         <ul>
  37.                             <?php if(!empty($child)):
  38.                                 foreach($child as $v2): extract($v2)?>
  39.                                 <li>
  40.                                     <?=$name?>
  41.                                     <ul>
  42.                                         <?php if(!empty($child)):
  43.                                             foreach($child as $v3): extract($v3)?>
  44.                                             <li>                                                <?=$name?>                         </li>
  45.                                         <?php endforeach;
  46.                                         endif?>
  47.                                     </ul>
  48.                                 </li>
  49.                             <?php endforeach;
  50.                             endif?>
  51.                         </ul>
  52.                     </li>
  53.                     <?php endforeach;
  54.                 endif?>
  55.             </ul>
  56.         </li>
  57.         <?php endforeach?>
  58.     </ul>
  59. </body>
  60. </html>

字符串操作函数

  1. $arr = ['html', 'css', 'vue'];
  2. $str = implode('|', $arr);
  3. // echo $str;
  5. // 合并，字符串->数组 explode
  6. // echo $_SERVER['REQUEST_URI'];
  7. $pathinfo = (explode("/", $_SERVER['REQUEST_URI']));
  8. echo array_pop($pathinfo); //弹出方法名称
  9. // 字符串的替换 str_replace($被替换内容, $替换内容,检测文档，替换次数)
  10. $search = ['广告','转账'];
  11. $chatMSG = '本公司代理各类广告，可转账。';
  12. $res = str_replace($search, "**",$chatMSG,$COUNT);
  13. echo $res, $COUNT;
  14. if($COUNT == 0){
  15.     // ws->sendMessage();
  16. }else{
  17.     // 警告功能    
  18. }
  19. // 字符串查找、截取
  20. // 随机形成验证码
  21. // echo rand();
  22. $str = md5(rand());
  23. $code = substr($str, 0,4);
  24. $color = '#'.substr(md5(mt_rand()), 0, 6);
  25. echo "<h1 style='color:{$color}'>{$code}</h1>";
  26. echo mb_substr('你吃饭了吗？', 1, 2);

有的电脑是REQUEST_URI，而不是DOCUMENT_URI

一些函数的使用

http_build_query、urlencode、 urldecode、base64_encode、base64_decode

  2. // url函数
  3. echo urlencode('韩寒');
  4. echo urldecode('%E9%9F%A9%E5%AF%92');
  6. // http_build_query(),生产urlencode之后的请求字符串
  7. $params = [
  8.     'city' => '北京',
  9.     'key' => '298uejkfl',
  10. ];
  11. $paramsString = http_build_query($params);
  12. echo $paramsString;
  13. ob_clean();
  15. // base64_encode()使用mime base64 对二进制字符串进行编码 ，目的是为了使二进制数据可以通过非纯8-bit的传输层传输，例如电子邮件的主体。
  16. // header('content-type:image/jpeg');
  17. $file = base64_encode(file_get_contents("https://img-nos.yiyouliao.com/alph/a21a0c67a67682baddf116e04826ef0d.jpeg?yiyouliao_channel=1536235174142947329_image"));
  18. echo $file;
  19. ?>
  20. <body>
  21.     <h1>您好！</h1>
  22.     <img src="data:image/jpeg;base64,<?=$file?>" alt="">
  23. </body>

总结：

递归函数挺有用，用于产品分类也很实用；字符串操作也是基本技能，必须掌握；后面的几个函数之前没接触过，先了解一下吧！

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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