PHP mb_substr() Function: Multibyte‑Safe Substring Operation
This article explains PHP’s mb_substr() function, detailing its multibyte‑safe substring behavior, parameter definitions, return value, and provides a practical code example illustrating how to extract a portion of a Chinese string correctly.
mb_substr() performs a multibyte‑safe substring operation on a string, counting positions from the start (0‑based) and optionally specifying length and encoding.
Parameters string $str: the input string. int $start: the starting character position. int $length = NULL: maximum number of characters to extract; if omitted or NULL, extracts to the end. string $encoding: character encoding; defaults to the internal encoding.
Return value
The function returns the portion of $str defined by $start and $length.
Example
<?php
echo mb_substr("我在中国", 0, 3);
// Output: 我在中
?>Note
Unlike the regular substr(), mb_substr() correctly handles multibyte characters such as Chinese.
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