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rtrim

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

rtrimElimina los espacios (u otros caracteres) al final de un string

Descripción

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

Esta función devuelve un string con los espacios (u otros caracteres) eliminados al final de string.

Sin el segundo parámetro, rtrim() eliminará estos caracteres:

  • " ": ASCII SP caracter 0x20, un espacio ordinario.
  • "\t": ASCII HT caracter 0x09, un tabulador.
  • "\n": ASCII LF caracter 0x0A, una nueva línea (line feed).
  • "\r": ASCII CR caracter 0x0D, un retorno de carro.
  • "\0": ASCII NUL caracter 0x00, el byte NULL.
  • "\v": ASCII VT caracter 0x0B, un tabulador vertical.

Parámetros

string
El string de entrada.
characters
Opcionalmente, los caracteres eliminados también se pueden especificar utilizando el parámetro characters. Simplemente enumere todos los caracteres que necesitan ser eliminados. Con .. es posible especificar un rango creciente de caracteres.

Valores devueltos

Devuelve el string modificado.

Ejemplos

Ejemplo #1 Ejemplo de uso de rtrim()

<?php

$text
= "\t\tAquí hay algunas palabras :) ... ";
$binary = "\x09String de ejemplo\x0A";
$hello = "Hola Mundo";
var_dump($text, $binary, $hello);

print
"\n";

$trimmed = rtrim($text);
var_dump($trimmed);

$trimmed = rtrim($text, " \t.");
var_dump($trimmed);

$trimmed = rtrim($hello, "Hdlor");
var_dump($trimmed);

// elimina los caracteres de control ASCII al final de $binary
// (de 0 a 31 inclusive)
$clean = rtrim($binary, "\x00..\x1F");
var_dump($clean);

?>

El resultado del ejemplo sería:

string(32) "        Aquí hay algunas palabras :) ...  "
string(16) "    String de ejemplo
"
string(10) "Hola Mundo"

string(30) "        Aquí hay algunas palabras :) ..."
string(26) "        Aquí hay algunas palabras :)"
string(6) "Hola M"
string(15) "    String de ejemplo"

Ver también

  • trim() - Elimina los espacios (u otros caracteres) al inicio y al final de un string
  • ltrim() - Elimina los espacios (u otros caracteres) del inicio de un string
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User Contributed Notes 6 notes

up
46
pinkgothic at gmail dot com
15 years ago
I have an obsessive love for php's array functions given how extremely easy they've made complex string handling for me in various situations... so, have another string-rtrim() variant:

<?php

function strrtrim($message, $strip) {
// break message apart by strip string
$lines = explode($strip, $message);
$last = '';
// pop off empty strings at the end
do {
$last = array_pop($lines);
} while (empty(
$last) && (count($lines)));
// re-assemble what remains
return implode($strip, array_merge($lines, array($last)));
}

?>

Astonishingly, something I didn't expect, but: It completely compares to harmor's rstrtrim below, execution time wise. o_o Whee!
up
29
gbelanger at exosecurity dot com
19 years ago
True, the Perl chomp() will only trim newline characters. There is, however, the Perl chop() function which is pretty much identical to the PHP rtrim()

---

Here's a quick way to recursively trim every element of an array, useful after the file() function :

<?php
# Reads /etc/passwd file an trims newlines on each entry
$aFileContent = file("/etc/passwd");
foreach (
$aFileContent as $sKey => $sValue) {
$aFileContent[$sKey] = rtrim($sValue);
}

print_r($aFileContent);
?>
up
27
todd at magnifisites dot com
21 years ago
This shows how rtrim works when using the optional charlist parameter:
rtrim reads a character, one at a time, from the optional charlist parameter and compares it to the end of the str string. If the characters match, it trims it off and starts over again, looking at the "new" last character in the str string and compares it to the first character in the charlist again. If the characters do not match, it moves to the next character in the charlist parameter comparing once again. It continues until the charlist parameter has been completely processed, one at a time, and the str string no longer contains any matches. The newly "rtrimmed" string is returned.
<?php
// Example 1:
rtrim('This is a short short sentence', 'short sentence');
// returns 'This is a'
// If you were expecting the result to be 'This is a short ',
// then you're wrong; the exact string, 'short sentence',
// isn't matched. Remember, character-by-character comparison!
// Example 2:
rtrim('This is a short short sentence', 'cents');
// returns 'This is a short short '
?>
up
15
pinkgothic at gmail dot com
12 years ago
On the recurring subject of string-stripping instead of character-stripping rtrim() implementations... the simplest (with a caveat) is probably the basename() function. It has a second parameter that functions as a right-trim using whole strings:

<?php

echo basename('MooFoo', 'Foo');

?>

...outputs 'Moo'.

Since it also strips anything that looks like a directory, it's not quite identical with hacking a string off the end:

<?php

echo basename('Zoo/MooFoo', 'Foo');

?>

...still outputs 'Moo'.

But sometimes it gets the job done.
up
18
Unimagined at UnaimaginedDesigns dot Com
20 years ago
I needed a way to trim all white space and then a few chosen strings from the end of a string. So I wrote this class to reuse when stuff needs to be trimmed.

<?php

class cleaner {

function
cleaner ($cuts,$pinfo) {
$ucut = "0";
$lcut = "0";
while (
$cuts[$ucut]) {
$lcut++;
$ucut++;
}
$lcut = $lcut - 1;
$ucut = "0";
$rcut = "0";
$wiy = "start";

while (
$wiy) {

if (
$so) {
$ucut = "0";
$rcut = "0";
unset(
$so);
}

if (!
$cuts[$ucut]) {
$so = "restart";
} else {
$pinfo = rtrim($pinfo);
$bpinfol = strlen($pinfo);
$tcut = $cuts[$ucut];
$pinfo = rtrim($pinfo,"$tcut");
$pinfol = strlen($pinfo);

if (
$bpinfol == $pinfol) {
$rcut++;
if (
$rcut == $lcut) {
unset(
$wiy);
}
$ucut++;
} else {
$so = "restart";
}
}
}

$this->cleaner = $pinfo;
}

}

$pinfo = "Well... I'm really bored...<br /><br>&nbsp; \n\t&nbsp;<br><br /><br>&nbsp; \r\r&nbsp;<br>\r<br /><br>\r&nbsp; &nbsp;\n<br> <br />\t";

$cuts = array('\n','\r','\t',' ',' ','&nbsp;','<br />','<br>','<br/>');

$pinfo = new cleaner($cuts,$pinfo);
$pinfo = $pinfo->cleaner;

print
$pinfo;

?>

That class will take any string that you put in the $cust array and remove it from the end of the $pinfo string. It's useful for cleaning up comments, articles, or mail that users post to your site, making it so there's no extra blank space or blank lines.
up
3
harmor
17 years ago
I'm sure there's a better way to strip strings from the end of strings.

<?php
/**
* Strip a string from the end of a string
*
* @param string $str the input string
* @param string $remove OPTIONAL string to remove
*
* @return string the modified string
*/
function rstrtrim($str, $remove=null)
{
$str = (string)$str;
$remove = (string)$remove;

if(empty(
$remove))
{
return
rtrim($str);
}

$len = strlen($remove);
$offset = strlen($str)-$len;
while(
$offset > 0 && $offset == strpos($str, $remove, $offset))
{
$str = substr($str, 0, $offset);
$offset = strlen($str)-$len;
}

return
rtrim($str);

}
//End of function rstrtrim($str, $remove=null)

echo rstrtrim('Hello World!!!', '!') .'<br />'; //"Hello World"
echo rstrtrim('Hello World!!!', '!!') .'<br />'; //"Hello World!"
echo rstrtrim('Hello World!!!', '!!!') .'<br />'; //"Hello World"
echo rstrtrim('Hello World!!!', '!!!!').'<br />'; //"Hello World!!!"
?>
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