How to Iterate through UTF-8 Strings Character by Character in PHP

Character-by-Character Iteration of UTF-8 Strings in PHP

When working with UTF-8 strings in PHP, accessing characters through indexing can yield unexpected results due to multibyte encoding. The question focuses on the challenge of iterating through a UTF-8 string character by character while maintaining character integrity.

To overcome the limitations of using the bracket operator, the solution lies in utilizing preg_split. By employing the "u" modifier, preg_split supports UTF-8 unicode and enables accurate splitting of characters:

<code class="php">$str = "Kąt";
$chrArray = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);</code>

This results in the following character array:

["K", "ą", "t"]

By leveraging preg_split, you can effectively iterate through a UTF-8 string character by character, retaining the integrity of multibyte characters and avoiding the performance penalty associated with mb_substr.

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