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require与include加载示例
若是梦终会醒
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1.demo.php文件内容

  1. <?php
  2. $porm = $_POST['load'] ?? null;
  3. echo $porm;
  4. $file = 'load.php';
  6. ?>
  7. <!DOCTYPE html>
  8. <html lang="zh-CN">
  10. <head>
  11.     <meta charset="UTF-8">
  12.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  13.     <title>加载</title>
  14.     <style>
  15.         * {
  16.             margin: 0;
  17.             padding: 0;
  18.         }
  20.         div {
  21.             width: 1000px;
  22.             height: 900px;
  23.             margin: 0 auto;
  24.         }
  26.         div>div {
  27.             width: 100%;
  28.             height: 33.3%;
  29.         }
  31.         .btn {
  32.             position: fixed;
  33.             top: 100px;
  34.             left: 50px;
  35.             font-size: 18px;
  36.         }
  38.         h3 {
  39.             color: red;
  40.         }
  41.     </style>
  42. </head>
  44. <body>
  45.     <div>
  46.         <?
  47.         switch (true):
  48.             case $porm < 2:
  49.                 if (file_exists($file) && is_file($file) && $porm) : //条件加载的条件
  50.                     echo '<h3>条件存在加载</h3>';
  51.                     include "{$file}";
  52.                 else :
  53.                     echo  '<h3>条件不存在加载</h3>';
  54.                     include 'default.php';
  55.                 endif;
  56.                 break;
  57.             case $porm < 4:
  58.                 if ($porm == 2) :
  59.                     echo '<h3>不去重加载</h3>';
  60.                     include "{$file}";
  61.                     include "{$file}";
  62.                     include "{$file}";
  63.                 else :
  64.                     echo '<h3>去重加载</h3>';
  65.                     include_once "{$file}";
  66.                     include_once "{$file}";
  67.                     include_once "{$file}";
  68.                 endif;
  69.                 break;
  70.             case $porm < 6:
  71.                 if ($porm == 4) :
  72.                     echo '<h3>强制加载</h3>';
  73.                     require "{$file}";
  74.                     require "{$file}";
  75.                     require "{$file}";
  76.                 else :
  77.                     echo '<h3>强制去重加载</h3>';
  78.                     require_once "{$file}";
  79.                     require_once "{$file}";
  80.                     require_once "{$file}";
  81.                 endif;
  82.                 break;
  83.                 case $porm < 8:
  84.                     if ($porm == 6) :
  85.                         echo '<h3>include和require加载区别之include加载</h3>';
  86.                         include "{$file}s";
  88.                     else :
  89.                         echo '<h3>include和require加载区别之require加载</h3>';
  90.                         require "{$files}s";
  91.                     endif;
  92.                     break;
  93.         endswitch;
  94.         ?>
  95.     </div>
  96.     <section class="btn">
  97.         <form action="demo.php" method="post">
  98.             <select name="load" id="" style='height: 50px; font-size: 16px; background: pink;'>
  99.                 <option value="0">条件不存在</option>
  100.                 <option value="1" <? echo $porm == 1 ? 'selected' : null; ?>>条件存在</option>
  101.                 <option value="2" <? echo $porm == 2 ? 'selected' : null; ?>>不去重加载</option>
  102.                 <option value="3" <? echo $porm == 3 ? 'selected' : null; ?>>去重加载</option>
  103.                 <option value="4" <? echo $porm == 4 ? 'selected' : null; ?>>强制加载</option>
  104.                 <option value="5" <? echo $porm == 5 ? 'selected' : null; ?>>强制去重加载</option>
  105.                 <option value="6" <? echo $porm == 6 ? 'selected' : null; ?>>include和require加载区别之include加载</option>
  106.                 <option value="7" <? echo $porm == 7 ? 'selected' : null; ?>>include和require加载区别之require加载</option>
  107.             </select>
  108.             <input type="submit" value="确定">
  109.         </form>
  110.     </section>
  111. </body>
  113. </html>

2.load.php文件内容

  1. <?php
  2. $str = <<< DIV
  3.         <div class="ifLoad" style="background-color: pink;"></div>
  4.        <div class="quzLoad" style="background-color: yellowgreen;"></div> 
  5. DIV;
  6. echo $str;

3.default.php文件内容

  1. <?php
  2. $str = <<< 'DIV'
  3.         <div class="quzLoad" style="background-color: yellowgreen;"></div>
  4.         <div class="ifLoad" style="background-color: pink;"></div>
  5. DIV;
  6. echo $str;

演示效果图:
1.条件不存在加载

2.条件存在加载

3.不去重加载

4.去重加载

5.强制加载

6.强制去重加载

7.include和require加载区别之include加载

8.include和require加载区别之require加载

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：这年案例不错 , 很直观, 以后可以借鉴到我的课程中
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