rtrim

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

rtrim — 去除字符串末尾的空白字符（或者其他字符）

说明

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

该函数去除 string 末尾的空白字符（或者其他字符）并返回。

不使用第二个参数，rtrim() 将去除以下字符：

" "： ASCII SP 字符 0x20，一个普通的空格。
"\t"： ASCII HT 字符 0x09，一个制表符。
"\n"： ASCII LF 字符 0x0A，一个换行符。
"\r"： ASCII CR 字符 0x0D，一个回车符。
"\0"： ASCII NUL 字符 0x00，一个 NUL 字节。
"\v"： ASCII VT 字符 0x0B，一个垂直制表符。

参数

string: 输入字符串。
characters: 可选，也可以使用 characters 参数指定要剥离的字符。只需列出所有需要剥离的字符。使用 .. 可以指定一个递增的字符范围。

返回值

返回改变后的字符串。

示例

示例 #1 rtrim() 使用示例

<?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);

// 删除 $binary 末端的 ASCII 码控制字符
// (包括 0 - 31)
$clean = rtrim($binary, "\x00..\x1F");
var_dump($clean);

?>

以上示例会输出：

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"

参见

trim() - 去除字符串首尾处的空白字符（或者其他字符）
ltrim() - 删除字符串开头的空白字符（或其他字符）

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用户贡献的备注 7 notes

down

pinkgothic at gmail dot com ¶

14 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!

down

gbelanger at exosecurity dot com ¶

18 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);

?>

down

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 '
?>

down

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.

down

pinkgothic at gmail dot com ¶

11 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.

down

harmor ¶

16 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!!!"

?>

down

-2

HW ¶

21 years ago

<?php

$text = "This string contains some unwanted characters on the end.";

$text1 = rtrim($text, 'a..z');

$text1 = rtrim($text1, '.');

echo $text1; // only the '.' is trimmed.

$text2 = rtrim($text, 'a..z.');

echo $text2; // The whole last word is trimmed.

?>