带有 eval 代码执行的heredoc

发布于 2024-08-02 02:30:23 字数 327 浏览 2 评论 0原文

我尝试了几种方法来尝试让它工作，但没有运气！

我有一个像这样的页面（示例）：

<?php
$jj = <<<END
?>
<h1>blah blah</h1>
<p> blah blah blah blah blah blah blah <?php include("file.php"); ?> blah blah</p>
<?php
END;
eval('?>'.$jj.'<?php ');
?>

这会导致没有输出，想不出解决方案！

原文

I've tryed a couple of methods to try and get this working but with no luck!

I've got a page like this (Example):

<?php
$jj = <<<END
?>
<h1>blah blah</h1>
<p> blah blah blah blah blah blah blah <?php include("file.php"); ?> blah blah</p>
<?php
END;
eval('?>'.$jj.'<?php ');
?>

this causes no output what so ever, can not think of a solution!

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忆梦 2024-08-09 02:30:23

这不起作用，因为 eval 只需要 PHP 代码（即不被标签包围），因此对 eval() 的调用可能会失败并出现解析错误。

我建议改用输出缓冲，例如：

<?php
//start output buffering, anything outputted should be stored in a buffer rather than being sent to the browser
ob_start();
?>

<h1>blah blah</h1>
<p> blah blah blah blah blah blah blah <?php include("file.php"); ?> blah blah</p>

<?php
//get contents of buffer and stop buffering
$content = ob_get_clean();
echo $content;
?>

This will not work because eval only expects PHP code (i.e. not surrounded by <?php ?> tags), so the call to eval() will probably fail with a parse error.

I would suggest using output buffering instead, for example:

<?php
//start output buffering, anything outputted should be stored in a buffer rather than being sent to the browser
ob_start();
?>

<h1>blah blah</h1>
<p> blah blah blah blah blah blah blah <?php include("file.php"); ?> blah blah</p>

<?php
//get contents of buffer and stop buffering
$content = ob_get_clean();
echo $content;
?>

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