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Bug #48177 Cannot wrap eval'd code with HTML
Submitted: 2009-05-07 10:13 UTC Modified: 2009-05-07 11:04 UTC
From: skds1433 at hotmail dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.2.9 OS: Windows Vista
Private report: No CVE-ID: None
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 [2009-05-07 10:13 UTC] skds1433 at hotmail dot com 
Description:
------------
For debugging purposes of a template system, I am trying to wrap the output of an eval inside pre HTML tags. Oddly, the tags are simply being appended.

PHP version: 5.2.9-2
Apache: 2.2.11

Reproduce code:
---------------
<?php
$buffer = 'testing 1 2 3, test test test test. 0123456789012345678901234567890123456789
012345678901234567890123456789
0123456789012345678901234567890123456789(<?php if (isset($global[\'testing1\'])): ?>testing1<?php if (isset($global[\'testing2\'])): ?> "testing2 extended"<?php if (isset($global[\'testing3\'])): ?> "testing3 extended"<?php endif; ?><?php endif; ?><?php endif; ?>)0123456789
012345678901234567890123456789

<?php if (isset($global[\'loop1\']) && is_array($global[\'loop1\'])): for($i=0;$i<count($global[\'loop1\']);$i++): ?><?=$global[\'loop1\'][\'var1\']?> <?=$global[\'loop1\'][\'var2\']?> <?php if ($global[\'loop1\'][\'showvar3\']): ?><?=$global[\'loop1\'][\'var3\']?><?php endif; ?><?php endfor; endif; ?>
<?php if (isset($global[\'testing4\'])): ?>testing4<?php if (isset($global[\'testing5\'])): ?> testing5<?php if (isset($global[\'testing6\'])): ?> <this is file1><?php endif; ?><?php endif; ?><?php endif; ?>';

$buffer = eval("?>".$buffer);
echo "<pre>".$buffer."</pre>";
?>

Expected result:
----------------
<pre>testing 1 2 3, test test test test. 0123456789012345678901234567890123456789
012345678901234567890123456789
0123456789012345678901234567890123456789()0123456789
012345678901234567890123456789

</pre>

Actual result:
--------------
testing 1 2 3, test test test test. 0123456789012345678901234567890123456789
012345678901234567890123456789
0123456789012345678901234567890123456789()0123456789
012345678901234567890123456789

<pre></pre>

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 [2009-05-07 10:22 UTC] skds1433 at hotmail dot com 
Changed category, from 'Output Control'. Not really sure what this applies to.
 [2009-05-07 10:38 UTC] mattwil@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

eval() doesn't return anything but NULL unless a return statement is used in the eval'd code (wouldn't work in this case with inline HTML anyway, which gets echo'd immediately). You'd need to 1) echo "<pre>"; before the eval() call, 2) use eval('return "testing 123, a string, not HTML...";'), or 3) use output buffering, etc.
 [2009-05-07 11:04 UTC] skds1433 at hotmail dot com 
Thank you for the explanation, that makes a lot of sense now that you mention it. Sorry for wasting your time.
 
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