Detailed explanation of PHP truncation function mb_substr()

In php, the mb_substr() function is a function used to cut Chinese and English characters

The mb_substr() function is not supported by default in php. We need to find php.ini in the windows directory, search for mbstring.dll, find ;extension=php_mbstring.dll, and remove the previous; sign before we can use mb_substr () function.

Function: mb_substr( $str, $start, $length, $encoding )
$str, the string that needs to be truncated
$start, the beginning of truncation
$length, length (1 represents a Chinese character)
$encoding, encoding, I set it to utf-8

Example:

$str="I am a good person!";
echo mb_substr($str,0,4,'utf-8'); //Result: I am a
?>

$str="I am a good man";

echo mb_substr($str,0,4,'utf-8'); //Result: I am

?>

Similar functions: mb_strcut() function

$str="I am a good man";

echo mb_substr($str,0,4,'utf-8'); //Result: I am

?>

$str="I am a good person!";
echo mb_substr($str,0,4,'utf-8'); //Result: me
?>