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博客列表 >php:1. 单文件上传与多文件上传 2. 简单分页操作,分页所需参数的意思

php:1. 单文件上传与多文件上传 2. 简单分页操作,分页所需参数的意思

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2022年05月01日 18:20:14489浏览

1. 单文件上传与多文件上传

单文件上传

  1. <?php
  2. if(isset($_FILES['my_pic'])){
  3.   extract($_FILES['my_pic']);
  4.   if($error>0){
  5.     $tips = '<span style="color:red">上传失败:</span>';
  6.     switch($error){
  7.       case 1:
  8.         $tips .='上传的文件超过限制值';
  9.         break;
  10.       case 2:
  11.         $tips .='上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。';
  12.         break;
  13.       case 3:
  14.         $tips .='文件只有部分被上传。';
  15.         break;
  16.       case 4:
  17.         $tips .='没有文件被上传';
  18.         break;
  19.       case 6:
  20.         $tips .='找不到临时文件夹';
  21.         break;
  22.       case 7:
  23.         $tips .='文件写入失败';
  24.         break;
  25.     }
  26.   echo "<p>$tips</p>";
  27.   }else{
  28.     //success
  29.     //判断是否通过表单上传is_upload_file
  30.     if(is_uploaded_file($tmp_name)){
  31.       //设置上传文件类型白名单
  32.       $allow = ['jpg','jpeg','png','gif'];
  33.       //获取文件扩展名
  34.       $ext = pathinfo($name)['extension'];
  35.       //判断扩展名是否在白名单
  36.       if(in_array($ext,$allow)){
  37.         $path = 'uploads/';
  38.         $dest = $path . time() . '.'.$ext;
  39.         if(move_uploaded_file($tmp_name,$dest)){
  40.           echo '<p style=color:green>上传成功</p>';
  41.           echo "<img src='$dest' alt='' width='200px'>";
  42.         }else{
  43.           echo '<p style=color:red>上传失败</p>';
  44.         }
  45.       }else{
  46.         echo '<p style=color:red>非法扩展名</p>';
  47.       }
  48.     }else{
  49.       echo '<p style=color:red>非法上传方式</p>';
  50.     }
  51.   }
  52. }
  54. ?>
  55. <!DOCTYPE html>
  56. <html lang="en">
  57.   <head>
  58.     <meta charset="UTF-8" />
  59.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  60.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  61.     <title>单文件上传</title>
  62.   </head>
  63.   <body>
  64.     <form action="" method="post" enctype="multipart/form-data">
  65.       <fieldset>
  66.         <legend>单文件上传</legend>
  67.         <input type="file" name="my_pic" id="" />
  68.         <button>上传</button>
  69.       </fieldset>
  70.     </form>
  72.   </body>
  73. </html>

多文件上传

  1. <?php
  2. if(isset($_FILES['my_pic'])){
  4.  foreach($_FILES['my_pic']['error'] as $key=>$value){
  6.     $tmp_name = $_FILES['my_pic']['tmp_name'][$key];
  7.     $path = 'uploads/' . time() .$key. '.' . pathinfo($_FILES['my_pic']['name'][$key])['extension'];
  8.     if(move_uploaded_file($tmp_name,$path)){
  9.         echo '<p style=color:green>上传成功</p>';
  10.         echo "<img src='$path' alt='' width='200px'>";
  11.       }else{
  12.         echo '<p style=color:red>上传失败</p>';
  13.       }
  14.  }
  16. }
  18. ?>
  19. <!DOCTYPE html>
  20. <html lang="en">
  21.   <head>
  22.     <meta charset="UTF-8" />
  23.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  24.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  25.     <title>多文件上传</title>
  26.   </head>
  27.   <body>
  28.     <form action="" method="post" enctype="multipart/form-data">
  29.       <fieldset>
  30.         <legend>单文件上传</legend>
  31.         <input type="file" name="my_pic[]" id="" multiple/>
  32.         <button>上传</button>
  33.       </fieldset>
  34.     </form>
  36.   </body>
  37. </html>

2. 简单分页操作,分页所需参数的意思

分页数据查询

  1. <?php
  2. $db = new PDO('mysql:host=127.0.0.1;dbname=statt;port=3306;charset=utf8','root','root');
  3. $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_ASSOC);
  4. // var_dump($db);
  6. //1.当前页
  7. $page = $_GET['p'] ?? 1;
  8. //2.每页显示数
  9. $num = 10;
  10. //3.总记录数
  11. $sql = 'SELECT COUNT(`id`) AS total FROM `user`';
  12. $statt = $db->prepare($sql);
  13. $statt->execute();
  14. //将某一列值与变量绑定
  15. $statt->bindColumn('total',$total);
  16. $statt->fetch();
  17. // echo '总记录数' . $total . '<br>';
  18. //4.总页数
  19. $pages = ceil($total/$num);
  21. // echo '总页数' . $pages;
  22. //5.偏移量（每页开始索引）
  23. $offset = ($page-1) * $num;
  24. // echo '偏移量' . $offset;
  25. //6.分页数据
  26. $sql = "SELECT * FROM `user` LIMIT $offset, $num";
  27. $statt = $db->prepare($sql);
  28. $statt->execute();
  29. $users = $statt->fetchAll();
  30. //遍历
  31. if(count($users) === 0){
  32.     echo '查询结果为空';
  33. }else{
  34.     foreach($users as $value){
  35.             // var_dump($value);
  36.     }
  37. }

分页数据展示

  1. <?php require 'page.php';      ?>
  2. <!DOCTYPE html>
  3. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>页面展示分页数据</title>
  9.     <style>
  10.         table {
  11.             width: 400px;
  12.             border-collapse: collapse;
  13.             text-align: center;
  14.         }
  16.         table th,
  17.         table td {
  18.             border: 1px solid;
  19.             padding: 5px;
  20.         }
  22.         table thead {
  23.             background-color: lightcyan;
  24.         }
  26.         table caption {
  27.             font-size: larger;
  28.             margin-bottom: 8px;
  29.         }
  31.         p>a {
  32.             text-decoration: none;
  33.             color: #555;
  34.             border: 1px solid;
  35.             padding: 5px 10px;
  36.             margin: 10px 2px;
  37.         }
  39.         .active {
  40.             background-color: seagreen;
  41.             color: white;
  42.             border: 1px solid seagreen;
  43.         }
  44.     </style>
  45. </head>
  46. <body>
  47.     <table>
  48.         <caption>员工信息表</caption>
  49.         <thead>
  50.             <tr>
  51.                 <th>ID</th>
  52.                 <th>姓名</th>
  53.                 <th>性别</th>
  54.                 <th>邮箱</th>
  55.             </tr>
  56.         </thead>
  57.         <tbody>
  58.             <?php foreach($users as $value): extract($value)?>
  59. <tr>
  60.     <td><?= $id ?></td>
  61.     <td><?= $name ?></td>
  62.     <td><?= $sex ?></td>
  63.     <td><?= $email ?></td>
  64. </tr>
  65.             <?php endforeach ?>
  66.         </tbody>
  67.     </table>
  68.     <p>
  69.         <?php for($i = 1; $i<=$pages; $i++): ?>
  70.             <?php
  71.              $url = $_SERVER['PHP_SELF'] . '?p=' .$i;
  73.              $active = $i == $_GET['p'] ? 'active' : null;
  74.             ?>
  75.             <a href="<?= $url ?>" class="<?= $active ?>"><?= $i ?></a>
  76.         <?php endfor ?>
  77.     </p>
  78. </body>
  79. </html>
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