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Last updated: Sat, 27 Jan 2007

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# strrev

(PHP 3, PHP 4, PHP 5)

strrev -- Переворачивает строку

## Description

string strrev ( string string )

Возвращает строку `string`, в которой порядок символов изменен на обратный.

Пример 1. Пример использования strrev()

`<?php echo strrev("Hello world!"); // выводит "!dlrow olleH" ?>`

add a note User Contributed Notes
strrev
carmel.alex at gmail.com
20-Dec-2006 10:38
`to lwc at mytrashmail dot com, take it easy.
function utf8_strrev($str, $reverse_numbers = true){
$pattern = $reverse_numbers ? '/./us' : '/(\d+)?./us';
preg_match_all($pattern, $str, $ar);
return join('',array_reverse($ar[0]));
}`
lwc at mytrashmail dot com
13-Oct-2006 04:01
`just as well for UTF-8 usages = I meant also for NONE UTF-8 usages (to keep the numbers unchanged)`
lwc at mytrashmail dot com
13-Oct-2006 01:35
`/*
Here's a function that adds to carmel.alex's utf-8 encoding support the ability NOT to reverse numbers (for example when you output a phrase as a parameter for a SWF file that can't handle RTL languages itself, but obviously any numbers should remain the same as in the original phrase).
Note that it can be used just as well for UTF-8 usages if you want the numbers to remain intact:
*/
function utf8_strrev($str, $reverse_numbers) {
preg_match_all('/./us', $str, $ar);
if ($reverse_numbers)
return join('',array_reverse($ar[0]));
else {
$temp = array();
foreach ($ar[0] as $value) {
if (is_numeric($value) && !empty($temp[0]) && is_numeric($temp[0])) {
foreach ($temp as $key => $value2) {
if (is_numeric($value2))
$pos = ($key + 1);
else
break;
}
$temp2 = array_splice($temp, $pos);
$temp = array_merge($temp, array($value), $temp2);
} else
array_unshift($temp, $value);
}
return implode('', $temp);
}
}
// "It says this site is copyrighted just from 2001" (in Hebrew)
$str = "כתוב שהאתר הזה מוגן בזכויות יוצרים רק מאז 2001";
// Reverse everything
$str_blind_reverse = utf8_strrev($str, true);
// Reverse everything but don't change the year 2001 to 1002...
$str_logical_reverse = utf8_strrev($str, false);`
carmel.alex at gmail.com
28-Feb-2006 12:54
`This function support utf-8 encoding
function utf8_strrev($str){
preg_match_all('/./us', $str, $ar);
return join('',array_reverse($ar[0]));
}`
tex at i18nguy dot com
22-Aug-2005 09:36
`Just a correction to the previous commenter. In ISO 8859-15, the Euro is 0xA4 (164 decimal). It is a 1 byte character.`
MagicalTux at FF dot st
12-May-2005 06:20
`I will make Screend at hf dot webex dot com's comment more clear and understandable.
strrev only works for singlebyte character-sets. Multibytes charactersets are not compatibles with strrev.
US-ASCII and ISO-8859-1 are compatible with strrev, however BIG5, SJIS, UTF-8 aren't.
Despite what you can think, ISO-8859-15 *is* multibyte (the euro symbol - � - is coded on two bytes).
There's no mb_strrev function in PHP, so you can't strrev() a multibyte string. Try to convert it to something else with iconv() if it can be represented in a singlebyte character set.`
avarab at gmail dot com
07-May-2005 12:53
`strrev() can be very useful in cases where it makes more sense to do something from the end of a string rather than the beginning (well duh!) such as apply certain regular expressions. Here's a small function to add commas to numbers that works in such a way.
<?php
echo commafy("1500000.1254"); // prints 1,500,000.1254
function commafy($_) {
return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,' , strrev( $_ ) ) );
}
?>
I originally wrote it in Perl, does it show? ;=)`
Screend at hf dot webex dot com
30-Mar-2004 08:17
`this function can only reverse the 1-byte words,like english,it seems,using
<?php
$str=strrev("����");
echo $str;
?>
do not get a right result.
but,you can change 2-bytes characters into a ASCLL,the converse it.`
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strripos strrchr

Last updated: Sat, 27 Jan 2007
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