不建议使用Preg Replace，尝试修复 [英] Preg replace deprecated, attempting to fix

问题描述

我刚刚升级到PHP 7，并不断完善与不推荐使用的功能相关的错误，

I've just upgraded to PHP 7 and have been hammering out errors associated with deprecated functions, with much success.

不幸的是，我一直无法为在交互式可折叠javascript事物中查看php数组"代码修复新的preg替换方法.

Sadly, I've been having trouble fixing the new preg replace methodology for my "view php array in a interactive collapsable javascript thing" code.

以下代码:

function print_r_tree($data)
{

// capture the output of $this->print_r_tree
   $out = print_r($data, true);

 // replace something like '[element] => <newline> (' with <a href="javascript:toggleDisplay('...');">...</a><div id="..." style="display: none;">
    $out = preg_replace('/([ \t]*)(\[[^\]]+\][ \t]*\=\>[ \t]*[a-z0-9 \t_]+)\n[ \t]*\(/iUe',"'\\1<a href=\"javascript:toggleDisplay(\''.(\$id = substr(md5(rand().'\\0'), 0, 7)).'\');\">\\2</a><div id=\"'.\$id.'\" style=\"display: none;\">'", $out);

  // replace ')' on its own on a new line (surrounded by whitespace is ok) with '</div>
     $out = preg_replace('/^\s*\)\s*$/m', '</div>', $out);

  // print the javascript function toggleDisplay() and then the transformed output
     echo '<script language="Javascript">function toggleDisplay(id) { document.getElementById(id).style.display = (document.getElementById(id).style.display == "block") ? "none" : "block"; }</script>'."\n$out";

  }

生成此警告. 警告:preg_replace():不再支持/e修饰符，请使用preg_replace_callback代替

Generates this warning. Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead

删除第一个"preg_replace"中的"e"会破坏javascript内容.我也尝试了一些preg_replace_callback事情.

Removing the "e" in the first "preg_replace", breaks the javascript thing. I've tried a few preg_replace_callback things as well.

我一直在尝试使用此链接替换preg_replace ()具有preg_replace_callback 的e修饰符，可帮助我了解发生了什么问题，但我认为我的问题因javascript而复杂化了.

I've been trying to use this link Replace preg_replace() e modifier with preg_replace_callback to help me understand what's broken, but I think my issue is complicated by the javascript.

就我的代码而言，我希望有人可以指导我完成这项工作吗?

I'm hoping someone might be able to walk me through this, with respect to my code?

谢谢.

推荐答案

e修饰符位于您的第一个$out变量中.要进行转换，您需要正确使用preg_replace_callback():

The e modifier is in your first $out variable. To transform that, you need to use correctly preg_replace_callback():

$out = preg_replace_callback('/([ \t]*)(\[[^\]]+\][ \t]*\=\>[ \t]*[a-z0-9 \t_]+)\n[ \t]*\(/iU', "callbackFunction", $out);

function callbackFunction($matches) {
     return "'".$matches[1]."<a href=\"javascript:toggleDisplay(\''.(\$id = substr(md5(rand().'".$matches[0]."'), 0, 7)).'\');\">".$matches[2]."</a><div id=\"'.\$id.'\" style=\"display: none;\">'";
}

请参见，在preg_replace_callback中，我们使用callbackFunction定义了第二个参数，该字符串被解析为调用该函数，并且将带有匹配项的数组传递给它.因此，替换项是在callbackFunction()函数中，而匹配项是matches[X].

See that in preg_replace_callback we define second parameter with callbackFunction, that string is parsed to call that function and it passes an array with the matches. So the replacements were in callbackFunction() function and the matches are matches[X].

更多信息:

http://php.net/manual/es/function .preg-replace-callback.php

祝你好运！

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