r，<pre>标记不起作用

这个问题在这里已经有了答案：

PHP解析/语法错误; 以及如何解决它们？ 13个答案

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根据提供的图像，代码将以这种方式显示

echo "<pre>";
print_r($levels);
echo "</pre>";

检查您的代码是否有语法错误

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Try this code . i will work.
<?php

    $levels = array(
        1 => array( 'name' => 'level 1', 'desc' => 'This is the first level' ),
        2 => array('name' => 'level 2', 'desc' => 'youve made it to level 2!'),
        3 => array('name' => 'level 3', 'desc' => 'The last level')
      );
      echo"<pre>";
      print_r($levels);
      echo "</pre>";
      ?>

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