编码字符（如果尚未编码）（使用rawurlencode和preg_replace_callback） [英] Encode characters if not already encoded (with rawurlencode and preg_replace_callback)

问题描述

我想用百分比编码表示形式（％xy ）替换字符串中的所有字符，但只用尚未百分比编码的字符代替。

例如，在字符串 abc＃％2Bdef 中， ％2B 部分已经是百分比编码的表示形式。因此，不应对其进行重新编码。编码后正确的结果应为： abc％23％2Bdef 。

此是我尝试过的方法-但结果仍然是 abc＃％2Bdef ：

  //模式：读取除百分比编码的字符（％xy）之外的所有字符。 
 $ pattern =‘/（？！％[a-fA-F0-9] {2}）/’； 
 $ string =‘abc＃％2Bdef’; 
 
 $ result = preg_replace_callback（$ pattern，function（$ matches）{
 return rawurlencode（$ matches [0]）; 
}，$ string）; 
 
 var_dump（$ result）; 
  

我认为这只是 $ pattern 的值应该更改，但我不确定。使用当前模式，不会调用回调中的 rawurlencode（）。

编码图例： ％23-> ＃ ， ％2B-> +

我今天尝试了很多小时才能找到正确的图案形式。一开始它似乎很简单……我非常感谢任何建议或解决方案。

非常感谢。

解决方案

最简单的方法是先解码以前的编码字符，然后重新编码所有字符串。

  $ string ='abc＃％2Bdef'; 
 $ string = rawurlencode（rawurldecode（$ string））; 
  

这将为您带来预期的结果。

  abc％23％2Bdef 
  

I want to replace all characters in a string with their percent-encoding representation (%xy), but only the ones that are not already percent-encoded.

For example, in the string abc#%2Bdef, the %2B part is already a percent-encoded representation. So it should not be re-encoded. The correct result after encoding should be: abc%23%2Bdef.

This is what I have tried - but the result is still abc#%2Bdef:

// Pattern: read all characters except the percent-encoded ones (%xy).
$pattern = '/(?!%[a-fA-F0-9]{2})/';
$string = 'abc#%2Bdef';

$result = preg_replace_callback($pattern, function($matches) {
    return rawurlencode($matches[0]);
}, $string);

var_dump($result);

I think it's just the $patternvalue that should be changed, but I'm not sure. And with the current pattern the rawurlencode() inside the callback is not called.

Encoding legend: %23 -> #, %2B -> +

I tried many hours today to find the right pattern form. And it seemed very simple in the beginning... I really appreciate any advice or solution.

Thank you very much.

解决方案

The easy way would be decoding previous encoded characters first, and then re-encoding all the string.

$string = 'abc#%2Bdef';
$string = rawurlencode(rawurldecode($string));

This would give you the expected result.

abc%23%2Bdef

这篇关于编码字符（如果尚未编码）（使用rawurlencode和preg_replace_callback）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！