如何在PHP中迭代UTF-8字符串? [英] How to iterate UTF-8 string in PHP?

问题描述

如何使用索引逐个字符地迭代UTF-8字符串?

How to iterate a UTF-8 string character by character using indexing?

使用方括号运算符$str[0]访问UTF-8字符串时，utf编码的字符包含2个或更多元素.

When you access a UTF-8 string with the bracket operator $str[0] the utf-encoded character consists of 2 or more elements.

例如:

$str = "Kąt";
$str[0] = "K";
$str[1] = "�";
$str[2] = "�";
$str[3] = "t";

但我希望拥有:

$str[0] = "K";
$str[1] = "ą";
$str[2] = "t";

可以使用mb_substr，但这非常慢，即.

It is possible with mb_substr but this is extremely slow, ie.

mb_substr($str, 0, 1) = "K"
mb_substr($str, 1, 1) = "ą"
mb_substr($str, 2, 1) = "t"

是否有另一种方法可以在不使用mb_substr的情况下逐字符插入字符串?

Is there another way to interate the string character by character without using mb_substr?

推荐答案

使用 preg_split .使用"u"修饰符，它支持UTF-8 Unicode

Use preg_split. With "u" modifier it supports UTF-8 unicode.

$chrArray = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);

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