rtrim()

rtrim() — Strip whitespace (or other characters) from the end of a string.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

This function returns a string with whitespace (or other characters) stripped from the end of string.

Signature

rtrim(string $string, string $characters = " \n\r\t\v\x00"): string

Parameters

Parameter	Type	What it takes
$string	string	The input string.
$characters	string	Optionally, the stripped characters can also be specified using the characters parameter. Simply list all characters that need to be stripped. With .. it is possible to specify an incrementing range of characters.

Return value

Returns the modified string.

Example

A runnable snippet:

$text = "\t\tThese are a few words :) ... "; $binary = "\x09Example string\x0A"; $hello = "Hello World"; var_dump($text, $binary, $hello); print "\n"; $trimmed = rtrim($text); var_dump($trimmed); $trimmed = rtrim($text, " \t."); var_dump($trimmed); $trimmed = rtrim($hello, "Hdle"); var_dump($trimmed); // trim the ASCII control characters at the end of $binary // (from 0 to 31 inclusive) $clean = rtrim($binary, "\x00..\x1F"); var_dump($clean);

Output:

string(32) " These are a few words :) ... " string(16) " Example string " string(11) "Hello World" string(30) " These are a few words :) ..." string(26) " These are a few words :)" string(9) "Hello Wor" string(15) " Example string"