(PHP 8 >= 8.4.0)
mb_rtrim — Strip whitespace (or other characters) from the end of a string
Performs a multi-byte safe rtrim() operation,
and returns a string with whitespace (or other characters) stripped from the
end of string.
Without the second parameter, rtrim() will strip these characters:
" ": ASCII SP character
0x20, an ordinary space.
"\t": ASCII HT character
0x09, a tab.
"\n": ASCII LF character
0x0A, a new line (line feed).
"\r": ASCII CR character
0x0D, a carriage return.
"\0": ASCII NUL character
0x00, the NUL-byte.
"\v": ASCII VT
character 0x0B, a vertical tab.
stringcharacterscharacters parameter.
Simply list all characters that need to be stripped.
With .. it is possible to specify an incrementing range of characters.
encodingReturns the modified string.