str_ireplace用作str_replace [英] str_ireplace works as str_replace

问题描述

我需要用url字符串中的小ascii字符替换所有本地字符(包括大写字母).

I need to replace all local characters (including upper case) with small ascii characters in a url string.

$str = "č-ć-đ-š-ž-Č-Ć-Đ-Š-Ž";
echo str_ireplace(array('č', 'ć', 'đ', 'š', 'ž'), array('c', 'c', 'd', 's', 'z'), $str);

结果-c-c-d-s-z-Č-Ć-Đ-Š-Ž
我预期-c-c-d-s-z-c-c-d-s-z

result - c-c-d-s-z-Č-Ć-Đ-Š-Ž
I expected - c-c-d-s-z-c-c-d-s-z

如何使用str_ireplace()函数获得预期结果.

How to get expected result using str_ireplace() function.

推荐答案

大多数PHP 字符串函数以字节序列(即单字节字符(ASCII))的形式处理字符串.

Most of the PHP string functions handle the strings as sequences of bytes, i.e. single-byte characters (ASCII).

您要替换包含多字节字符的字符串中的字符. str_replace() (有点)有效是因为它不在乎将字符串解释为字符.它用另一个字节序列替换了一个字节序列，仅此而已.在大多数情况下，在使用ASCII甚至是UTF-8编码的字符串时，它都不会破坏任何内容(因为UTF-8的设计方式).但是，使用其他编码可能会产生意想不到的结果.

You want to replace characters in a string that contains multi-byte characters. str_replace() (kind of) works because it doesn't care to interpret the strings as characters. It replaces a sequence of bytes with another sequence of bytes and that's all. Most of the times it will not break anything while working with ASCII or even UTF-8 encoded strings (because the way UTF-8 was designed). However, it can produce unexpected results with other encodings.

当要求处理ASCII范围之外的字符时，请使用[str_ireplace()](http://php.net/manual/en/function.str-ireplace.php) works the same as str_replace()`.它的不区分大小写"功能要求将字符串拆分为char并识别小写-大写对.但是，由于它不处理多字节字符，因此无法识别代码大于127的任何字符.

When asked to handle characters outside the ASCII range, [str_ireplace()](http://php.net/manual/en/function.str-ireplace.php) works the same asstr_replace()`. It's "case insensitive" functionality requires splitting the strings into chars and recognizing the lowercase-uppercase pairs. But since it doesn't handle multi-byte characters it cannot recognize any character whose code is greater than 127.

对于多字节字符串，您应该使用多字节字符串 PHP扩展.

For multi-byte character strings you should use the functions provided by the Multibyte String PHP extension.

它提供的唯一字符串替换功能是 mb_ereg_replace() (不区分大小写的版本 mb_eregi_replace() )，但它们并不能为您提供太大帮助(因为它们不能用于数组).

The only function it provides for strings replacement is mb_ereg_replace() (with the case-insensitive version mb_eregi_replace()) but they don't help you very much (because they don't work with arrays).

如果您要替换的字符列表是固定的，我的建议是使用

If the list of characters you want to replace is fixed, my suggestion is to use str_replace() with a list of characters that includes both cases:

$str = "č-ć-đ-š-ž-Č-Ć-Đ-Š-Ž";
echo str_replace(
         array('č', 'ć', 'đ', 'š', 'ž', 'Č', 'Ć', 'Đ', 'Š', 'Ž'), 
         array('c', 'c', 'd', 's', 'z', 'c', 'c', 'd', 's', 'z'),
         $str
     );

这篇关于str_ireplace用作str_replace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！