显示PHP代码而不是输出


PHP code is displayed instead of the output

有人能解释一下这段代码吗,我正在遵循一本非常好的书,这是推荐给我的,我已经输入了代码,就像它在书中一样。它显示的代码,而不是出来,我不知道是什么错了,代码是从一本书叫做php解决方案

          <?php
                     // set the max upload size in bytes
                      $max = 51200;
                     if(isset($_POST['upload'])){
                // define the path to the upload folder
                $destination = 'C:'upload_test';
                 // move the file to the uplaod folder and rename it
                move_uploaded_file($_FILES['image']
                    ['tmp_name'],     $destination.$_FILES['image']['setara']);
                    }
                    ?>



    <!doctype html>
    <html  lang="en">
    <head>
    <meta charset="utf-8">
    <title>Mult</title>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    </head>
    <body>


    <form action="" method="post" enctype="mutipar/form-data" id="uploadImage">
        <p>
            <label for="image">Upload image:</label>
            <input type="hidden"name="MAX_FILE_SIZE" value="<?php echo $max; ?>">
            <input type="file" name="image" id="image">
        </p>
        <p>
            <input type="submit" name="upload" id="upload" value="Upload">
        </p>
    </form>



</body>
</html>

这肯定是因为您正在编写PHP代码在。html或。htm扩展文件尝试把代码与。PHP扩展文件。