PHP removes the last character of a string and uses substr and mb_substr

Ordinary string:

Original string: 1,2,3,4,5,6,

This string: 1,2,3,4,5,6, remove the last character ","

Remove the last character ",", the final result is 1,2,3,4,5,6

$str = "1,2,3,4,5,6,";
$newstr = substr($str,0,strlen($str)-1);
echo $newstr;

Chinese character string:

Original string: Wuzhou City

Remove the last Chinese character "city" , the final result is Wuzhou (utf-8 encoding)

$get_city='梧州市';
$get_city=mb_substr($get_city,0,strlen($get_city)-3); 
echo $get_city;

The above introduces the use of PHP to remove the last character of a string with substr and mb_substr, including the content of substr. I hope friends who are interested in PHP tutorials can learn from it. help.