Last 5.3 release ever available: PHP 5.3.29 - 5.3 now EOL

strrev

(PHP 4, PHP 5)

strrevInverte una stringa

Descrizione

string strrev ( string $string )

Restituisce la stringa string invertita.

Example #1 Invertire una stringa con strrev()

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

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User Contributed Notes 7 notes

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1
vsrikanth02 at gmail dot com
3 months ago
$string = 'srikanth';
$length = strlen($string);

for($i=$length-1;$i >=0;$i--){
    echo $string[$i];
}
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0
carmel.alex at gmail.com
8 years ago
This function support utf-8 encoding

function utf8_strrev($str){
    preg_match_all('/./us', $str, $ar);
    return join('',array_reverse($ar[0]));
}
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-3
vsrikanth02 at gmail dot com
3 months ago
$string = 'srikanth';
$length = strlen($string);

for($i=$length-1;$i >=0;$i--){
    echo $string[$i];
}
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-5
MagicalTux at FF dot st
9 years ago
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-* are compatible with strrev, however BIG5, SJIS, UTF-8 aren't.

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.
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-6
manfred at werkzeugH dot at
6 years ago
here is my version for strings with utf8-characters represented as numerical entities  (e.g. &#1234;)

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;
}
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-4
sheik dot ks at gmail dot com
3 months ago
$str = "sheik";
$arr1 = str_split($str);
$revstr='';
$i=count($arr1);
while($i >= 0){
    $revstr .= $arr1[$i];
    $i--;
}
echo $revstr;
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-7
dthawkins+php at gmail dot com
4 months ago
Reverse a string without using any functions

function reverse_string($s) {
        $i = 0;
        $rev = '';
        while ( $s[$i] ) {
                $i++;
        }
        $i--;
        while ( $s[$i] ) {
                $rev .= $s[$i];
                $i--;
        }
        return $rev;
}
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