Reverse a string with php - php

Question

I am trying to find a way to reverse a string, I've seen alternatives but i wanted to to it this way thinking outside the box and not using anyone else's code as an alternative, the code below reverses the string but I keep getting this error:
Notice: Undefined offset: 25 in C:\wamp\www\test\index.php on line 15
25 being the length of the string which is being deincremented.
//error_reporting(NULL);
$string = trim("This is a reversed string");
//find length of string including whitespace
$len =strlen($string);
//slipt sting into an array
$stringExp = str_split($string);
//deincriment string and echo out in reverse
for ($i = $len; $i >=0;$i--)
{
echo $stringExp[$i];
}
thanks in advance

Answer 1

You're trying much too hard, always consult the manual and/or a search engine to check if there are native functions to do what you want before you end up "reinventing the wheel":
strrev — Reverse a string
http://php.net/manual/en/function.strrev.php
$string = "This is a reversed string";
echo strrev($string);
// Output: gnirts desrever a si sihT

Answer 2

As others said, there's strrev() to do this.
If you want to build it on your own (for learning?): your problem is that you're starting with your index one too high - a string of length 25 is indexed from 0 to 24, so your loop has to look like this:
for ($i = $len - 1; $i >=0;$i--)
{
echo $stringExp[$i];
}

Answer 3

$string = 'mystring';
$length = strlen($string);
for ($i = $length; $i > 0; $i--){
echo $string[$i-1];
}
OUTPUT: gnirtsym

Answer 4

You must get $len-1 because string starts from 0 to $len-1

Answer 5

There is a function for this strrev

Answer 6

echo strrev("This is a reversed string!");

Answer 7

php is quite complete in term of string function you just need to pass the string . thats why php is easy :)
use strrev php function http://bg2.php.net/manual/en/function.strrev.php
<?php
echo strrev("This is a reversed string");
?>
// Output: gnirts desrever a si sihT

Answer 8

<?php
// Reversed string and Number
// For Example :
$str = "hello world. This is john duvey";
$number = 123456789;
$newStr = strrev($str);
$newBum = strrev($number);
echo $newStr;
echo "<br />";
echo $newBum;
OUTPUT :
first : yevud nhoj si sihT .dlrow olleh
second: 987654321

Answer 9

for ($i = $len-1; $i >=0;$i--)
{
echo $stringExp[$i];
}
Since the index starts at 0

Answer 10

Change your for loop to
for ($i = $len-1; $i >=0;$i--)
{
echo $stringExp[$i];
}

Answer 11

<?php
echo strrev("PHP TUTORS");
?>
OUTPUT OF THE ABOVE SCRIPT
SROTUT PHP
Reference Source Code

Answer 12

You can use it:
echo $reversed_s = join(' ',array_reverse(explode(' ',"Hello World")));

Answer 13

public function stringReverse($string="Jai mata di")
{
$length = strlen($string) - 1;
$i = 0;
while ($i < $length + 1) {
echo $string[$length - $i];
$i++;
}
}

Answer 14

We can do String Reverse with help of following menthods
$string = "Hello world!";
1st way to do:
echo strrev($string);
2nd way to do:
$stringSplit = str_split($string);
for ($i = $len-1; $i >=0;$i--)
{
echo $stringSplit[$i];
}

Answer 15

This will work
class StringUtils {
public function stringReverse($string){
$arr1 = str_split($string);
$arr2 = array();
for($i = count($arr1); $i >= 0; $i--){
$arr2[count($arr1) - $i] = $arr1[$i];
}
return implode("", $arr2);
}
}

Answer 16

<?php
/* Reverse a string with php */
echo strrev("Hello World!");
?>
Reverse a string php