require与include加载示例

1.demo.php文件内容

<?php
$porm = $_POST['load'] ?? null;
echo $porm;
$file = 'load.php';
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>加载</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        div {
            width: 1000px;
            height: 900px;
            margin: 0 auto;
        }
        div>div {
            width: 100%;
            height: 33.3%;
        }
        .btn {
            position: fixed;
            top: 100px;
            left: 50px;
            font-size: 18px;
        }
        h3 {
            color: red;
        }
    </style>
</head>
<body>
    <div>
        <?
        switch (true):
            case $porm < 2:
                if (file_exists($file) && is_file($file) && $porm) : //条件加载的条件
                    echo '<h3>条件存在加载</h3>';
                    include "{$file}";
                else :
                    echo  '<h3>条件不存在加载</h3>';
                    include 'default.php';
                endif;
                break;
            case $porm < 4:
                if ($porm == 2) :
                    echo '<h3>不去重加载</h3>';
                    include "{$file}";
                    include "{$file}";
                    include "{$file}";
                else :
                    echo '<h3>去重加载</h3>';
                    include_once "{$file}";
                    include_once "{$file}";
                    include_once "{$file}";
                endif;
                break;
            case $porm < 6:
                if ($porm == 4) :
                    echo '<h3>强制加载</h3>';
                    require "{$file}";
                    require "{$file}";
                    require "{$file}";
                else :
                    echo '<h3>强制去重加载</h3>';
                    require_once "{$file}";
                    require_once "{$file}";
                    require_once "{$file}";
                endif;
                break;
                case $porm < 8:
                    if ($porm == 6) :
                        echo '<h3>include和require加载区别之include加载</h3>';
                        include "{$file}s";
                    else :
                        echo '<h3>include和require加载区别之require加载</h3>';
                        require "{$files}s";
                    endif;
                    break;
        endswitch;
        ?>
    </div>
    <section class="btn">
        <form action="demo.php" method="post">
            <select name="load" id="" style='height: 50px; font-size: 16px; background: pink;'>
                <option value="0">条件不存在</option>
                <option value="1" <? echo $porm == 1 ? 'selected' : null; ?>>条件存在</option>
                <option value="2" <? echo $porm == 2 ? 'selected' : null; ?>>不去重加载</option>
                <option value="3" <? echo $porm == 3 ? 'selected' : null; ?>>去重加载</option>
                <option value="4" <? echo $porm == 4 ? 'selected' : null; ?>>强制加载</option>
                <option value="5" <? echo $porm == 5 ? 'selected' : null; ?>>强制去重加载</option>
                <option value="6" <? echo $porm == 6 ? 'selected' : null; ?>>include和require加载区别之include加载</option>
                <option value="7" <? echo $porm == 7 ? 'selected' : null; ?>>include和require加载区别之require加载</option>
            </select>
            <input type="submit" value="确定">
        </form>
    </section>
</body>
</html>

2.load.php文件内容

<?php
$str = <<< DIV
        <div class="ifLoad" style="background-color: pink;"></div>
       <div class="quzLoad" style="background-color: yellowgreen;"></div> 
DIV;
echo $str;

3.default.php文件内容

<?php
$str = <<< 'DIV'
        <div class="quzLoad" style="background-color: yellowgreen;"></div>
        <div class="ifLoad" style="background-color: pink;"></div>
DIV;
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

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