php - urlencode to lower case in PHP

Question

In PHP, when url encoding using urlencode(), the outputted characters are in upper case:

echo urlencode('MyString'.chr(31));
//returns 'MyString%1F'

I need to get PHP to give me back 'MyString%1f' for the above example but not to lower case any other part of the string. in order to be consistent with other platforms. Is there any way I can do this without having to run through the string one character at a time, working out if I need to change the casing each time?

Answer 1

你为什么要这样做呢？F或者f，它不应该有任何区别，因为百分比编码是不区分大小写的。我能想到的唯一情况是在创建哈希时，但是我个人会将整个字符串转换为大写或小写，即不区分大小写。

无论如何，如果你真的需要这样做，那么使用它应该相对容易preg_replace_callback：

$original = 'MyString%1F%E2%FOO%22';
$modified = preg_replace_callback('/%[0-9A-F]{2}/', function(array $matches)
{
    return strtolower($matches[0]);
},
$original);

var_dump($modified);

这应该给你：

string(18) "MyString%1f%e2%FOO%22"