Using mb_strcut() to Extract Substrings by Bytes in PHP

mb_strcut() – Getting a Portion of a String by Bytes

The mb_strcut() function extracts a substring from a string based on byte positions, similar to mb_substr() but operates on bytes rather than characters, preventing malformed byte sequences that substr() may produce.

Parameters

str : The input string to be cut.

start : Starting position in bytes.

length : Byte length to extract; if omitted or NULL, extracts to the end.

encoding : Character encoding; defaults to the internal encoding if omitted.

Return

The function returns the portion of str defined by start and length.

Example

<?php
header("content-Type:text/html;charset=utf-8");
// test
$cn_str = "钓鱼岛是中国的hehe";
$en_str = "this is just a test";

echo "mb_strcut-3:" . mb_strcut($cn_str, 0, 3) . '<br/><br/>';
// byte-based cut
echo "mb_strcut-4:" . mb_strcut($cn_str, 0, 4) . '<br/><br/>';
?>