strrchr
This is funny function for write upside down:
<?php
function strflip($text)
{
$text=strrev($text);
$text=strtolower($text);
$arr = array(
"a" => "ɐ",
"b" => "q",
"c" => "ɔ",
"d" => "p",
"e" => "ǝ",
"f" => "ɟ",
"g" => "·",
"h" => "ɥ",
"i" => "ı",
"j" => "ɾ",
"k" => "ʞ",
"l" => "ʃ",
"m" => "ɯ",
"n" => "u",
"p" => "d",
"q" => "b",
"r" => "ɹ",
"t" => "ʇ",
"u" => "n",
"v" => "ʌ",
"w" => "ʍ",
"y" => "ʎ",
"B" => "D"
);
$result = strtr($text,$arr);
return $result;
}
$text = "My name is Dyas Yaskur";
echo strflip($text); //ɹnʞsɐʎ sɐʎp sı ǝɯɐu ʎɯ
?>
strrev
(PHP 4, PHP 5)
strrev — Reverte uma string
Descrição
string strrev
( string $string
)
Retorna a string revertida.
Parâmetros
- string
-
A string a ser revertida.
Valor Retornado
Retorna a string revertida.
Exemplos
Exemplo #1 Revertendo uma string strrev()
<?php
echo strrev("Hello world!"); // mostra "!dlrow olleH"
?>
add a note
User Contributed Notes
strrev
dyaskur at gmail dot com
27-Mar-2012 05:09
qeremy [atta] gmail [dotta] com
24-Feb-2012 09:34
An easy way for unicode string reversing;
<?php
function strrev_utf8($str) {
return join("", array_reverse(
preg_split("//u", $str)
));
}
$str = "Şeker yârim!"; // My sugar love
echo $str."\n";
echo strrev($str)."\n"; // !mir��y reke��
echo strrev_utf8($str); // !mirây rekeŞ
?>
lwc at trashymail dot com
18-Jun-2008 11:00
manfred at werkzeugH dot at, your version works, but do you think it has an advantage over mine? Just wondering if I should update my scripts.
carmel.alex at gmail.com, your version fails with utf8_strrev($string, true). It's something about spaces.
For example, you turn
This software was protected by 2000 patents since 2001
into
2001 ecnis stnetap2000 yb detcetorp saw erawtfos sihT
(note the "stnetap2000").
manfred at werkzeugH dot at
26-May-2008 10:35
here is my version for strings with utf8-characters represented as numerical entities (e.g. Ӓ)
function utf8_entities_strrev($str, $preserve_numbers = true)
{
//split string into string-portions (1 byte characters, numerical entitiesor numbers)
$parts=Array();
while ($str)
{
if ($preserve_numbers && preg_match('/^([0-9]+)(.*)$/',$str,$m))
{
// number-flow
$parts[]=$m[1];
$str=$m[2];
}
elseif (preg_match('/^(\&#[0-9]+;)(.*)$/',$str,$m))
{
// numerical entity
$parts[]=$m[1];
$str=$m[2];
}
else
{
$parts[]=substr($str,0,1);
$str=substr($str,1);
}
}
$str=implode(array_reverse($parts),"");
return $str;
}
Anonymous
18-Dec-2007 07:30
MOD10, Modulus10 or also called LUHN10 will generate a valid check digit.
<?php
$inv = "34586";
echo $inv . checkdigit($inv);
// Outputs 345868
function checkdigit($num) {
$sum = 0;
$pos = 0;
$rev = strrev($num);
$len = strlen($num);
if ($len % 2 == 0) $len += 1;
while ($pos < $len) {
$odd = $rev[$pos] * 2;
if ($odd > 9) {
$odd -= 9;
}
$sum += $odd;
if ($pos != ($len - 2)) {
$sum += $rev[$pos +1];
}
$pos += 2;
}
return ((floor($sum/10) + 1) * 10 - $sum) % 10;
}
?>
carmel.alex at gmail.com
20-Dec-2006 03:38
to lwc at mytrashmail dot com, take it easy.
function utf8_strrev($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 10:01
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 07:35
/*
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
27-Feb-2006 05:54
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 03:36
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 12:20
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
06-May-2005 06:53
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 01:17
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.