PHP mb_substr Function: Multibyte‑Safe Substring Extraction
This article explains the PHP mb_substr() function, detailing its multibyte‑safe substring behavior, parameter list (str, start, length, encoding), return value, and provides a clear example showing how to extract the first two characters from a Chinese string.
The PHP mb_substr() function retrieves a portion of a string in a multibyte‑safe manner.
It counts positions from the start of the string, with the first character at index 0, the second at 1, and so on.
Signature:
string mb_substr(string $str, int $start[, int $length = NULL[, string $encoding = mb_internal_encoding()]])Parameters:
str : the source string.
start : the position of the first character to include.
length : the maximum number of characters to extract; if omitted or NULL, extracts to the end of the string.
encoding : character encoding; defaults to the internal encoding if omitted.
Return value: the extracted substring according to the given start and length.
Example:
<?php
echo mb_substr("帅哥美女", 0, 2);
// Output: 帅哥
?>Signed-in readers can open the original source through BestHub's protected redirect.
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