PHP: strrev - Manual

Description

string strrev ( string string )

Returns string, reversed.
Example 1. Reversing a string with strrev()

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

User Contributed Notes
strrev

MagicalTux at FF dot st
12-May-2005 08:20


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 02:53


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 10:17


this function can only reverse the 1-byte words,like english,it seems,using

<?php

$str=strrev("şş×Ö");

echo $str;

?>

do not get a right result.

but,you can change 2-bytes characters into a ASCLL,the converse it.