转义“<?php”和“？”输出到文件时 - nowdoc/heredoc - 话题

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发布于 2024-10-14 11:15:36 字数 604 浏览 7 评论 0 原文

我试图做的（实际上可以，但只能在我的本地测试服务器上）是用 php 输出一个 php 文件。
问题似乎出在 php 的开始和结束标签上。
我在 php.net 中查找了 nowdoc 但找不到解决方案的线索。如果我像这样使用它：

$fh = fopen($filenameandpath, 'w') or die("can't open file");
$stringData = <<<'WWR'
<?php
echo('test');
?>
WWR;
$suc = fwrite($fh, $stringData);
fclose($fh);

我会收到解析错误：

解析错误：语法错误，/home/ua000154/public_html/test.php 第 XX 行出现意外的 T_SL

此解析错误的行号始终是找到起始 php 标记的位置。我的问题似乎是我需要转义这个标签（我想我应该对结束标签做同样的事情）

我该怎么做？这实际上在我的测试服务器上有效，但一旦我将其上传到另一台服务器上的最终位置，它就不起作用了。

任何帮助表示赞赏。感谢您抽出时间！

原文

What I was trying to do (and could, actually but only on my local testserver) is to output a php-file with php.
The problem seems to be the opening and closing tags of php.
I looked up nowdoc in php.net but could not find a clue to the solution.
If I use it like this:

$fh = fopen($filenameandpath, 'w') or die("can't open file");
$stringData = <<<'WWR'
<?php
echo('test');
?>
WWR;
$suc = fwrite($fh, $stringData);
fclose($fh);

I get a parsing error:

Parse error: syntax error, unexpected T_SL in /home/ua000154/public_html/test.php on line XX

The linenumber of this parsing error is always where the opening php-tag is found. My problem seems to be that I need to escape this tag (I presume I should do the same with the closing tag)

How could I do this? This actually worked on my test server but would not once I uploaded it to the final location on another server.

Any help is apreciated. Thanks you for your time!

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花落人断肠 2024-10-21 11:15:36

如果您有意使用NOWDOC 语法，请确保您的 PHP 服务器正在运行 5.3 或更高版本，因为它是在那时引入的。（您可以使用 phpinfo(); 进行检查）。这可以解释为什么它可以在您的开发服务器上运行，但不能在生产服务器上运行。

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╰ゝ天使的微笑 2024-10-21 11:15:36

好的，这是一个已经回答的老问题，但是这对于任何想要在早期版本的 php 中实现与NOWDOC 类似概念的人来说可能会有用。它使用输出缓冲从源文件中逐字捕获文本，无需任何变量解析等。即，如果您想插入变量，则没有太多用处，但您实际上可以在其中放入任何内容，只要它不包含字符“?>”，终止它。

请注意，它与使用 >>>TERMINATOR 和 >>>'TERMINATOR' 的 HEREDOC 和 NOWDOC 不同，因为变量是在文档之后定义的。

<?PHP

    function NOWDOC_() {
        ob_start();
    }

    function _NOWDOC(&$buf=false) {
        $buf_ = ob_get_contents();
        ob_end_clean();
        if ($buf!==false) $buf .= $buf_;
        return $buf_;
   }



   NOWDOC_(); ?>random garbage, not shown, but captured into $myvar 


   it has all sorts ] [* \%&  of characters in it

   and completely ignores things like {$this} or $_SERVER['REMOTE_ADDR';

   <?PHP _NOWDOC($myvar);





   NOWDOC_(); ?><HTML><HEAD></HEAD>

   <BODY>Here is some <B>nice</B> HTML & .

     <SCRIPT>

      alert("javascript!");

     </SCRIPT>  

           this also demonstrates using $var = _NOWDOC() syntax.


   </BODY>

   </HTML><?PHP $myhtml = _NOWDOC();


   echo "the html will be [".$myhtml."]";

?>

Ok, so this is an old question that has been answered, however this may be of use for anyone who wants to implement a similar concept to NOWDOC in earlier versions of php. it uses output buffering to capture text verbatim from the source file, without any variable parsing etc. ie not a lot of use if you WANT to insert variables, but you can literally put anything in it, as long as it does not include the characters "?>", which terminates it.

note that it differs from HEREDOC and NOWDOC that used >>>TERMINATOR and >>>'TERMINATOR' in that the variable is defined after the document.

<?PHP

    function NOWDOC_() {
        ob_start();
    }

    function _NOWDOC(&$buf=false) {
        $buf_ = ob_get_contents();
        ob_end_clean();
        if ($buf!==false) $buf .= $buf_;
        return $buf_;
   }



   NOWDOC_(); ?>random garbage, not shown, but captured into $myvar 


   it has all sorts ] [* \%&  of characters in it

   and completely ignores things like {$this} or $_SERVER['REMOTE_ADDR';

   <?PHP _NOWDOC($myvar);





   NOWDOC_(); ?><HTML><HEAD></HEAD>

   <BODY>Here is some <B>nice</B> HTML & .

     <SCRIPT>

      alert("javascript!");

     </SCRIPT>  

           this also demonstrates using $var = _NOWDOC() syntax.


   </BODY>

   </HTML><?PHP $myhtml = _NOWDOC();


   echo "the html will be [".$myhtml."]";

?>

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