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rtrim

(PHP 4, PHP 5, PHP 7, PHP 8)

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

Description

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

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

Without the second parameter, rtrim() will strip these characters:

Parameters

string
The input string.
characters
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 Values

Returns the modified string.

Examples

Example #1 Usage example of rtrim()

<?php

$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);

?>

The above example will 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"

Example #1 similar_text() argument swapping example

This example shows that swapping the string1 and string2 argument may yield different results.

<?php
$sim = similar_text('bafoobar', 'barfoo', $perc);
echo "similarity: $sim ($perc %)\n";
$sim = similar_text('barfoo', 'bafoobar', $perc);
echo "similarity: $sim ($perc %)\n";

The above example will output something similar to:

similarity: 5 (71.428571428571 %)
similarity: 3 (42.857142857143 %)

See Also