strrev(): PHP String Reverse

Reverse a simple string

strrev() reverses a string byte by byte. It is straightforward for simple ASCII text but is not multibyte-aware for general UTF-8 text.

$text = 'plus2net';
echo strrev($text); // ten2sulp

echo strrev('plus2net'); //ten2sulp

Syntax

$input_string = "plus2net";
echo strrev($input_string); // ten2sulp

$input_string: Input string to be reversed
Output is the string after reversing input string.

The original ( input string ) remains same.

We can reverse any string by applying strrev() function.
Here is the code

$st="This is a test";
echo "The string = ".$st."<br>";
$st=strrev($st);
echo "The new string after applying the strrev function = ".$st."<br>";

Printing the string in reverse without using strrev() function.

Here is the code.

$st="Hello world";
//echo $st[4];
$length=strlen($st);
for($i=$length-1;$i>=0;$i--){
echo $st[$i];
}

Output is here

dlrow olleH

Encoding note: strrev() reverses bytes, not UTF-8 characters. Use a Unicode-aware approach when you need to reverse user-visible characters.

Palindrome

A string is palindrome if reverse of the string is same as main string.
Check the string or number is Palindrome or not in PHP

Escape reversed text before displaying it in HTML

Reversing a string that contains angle brackets does not preserve valid markup. Escape the reversed result at the HTML output boundary; htmlspecialchars() prevents brackets from being interpreted as tags.

$text = "Hello <World>";
// Reverse the text first; escape it when displaying in HTML.
echo htmlspecialchars(strrev($text), ENT_QUOTES | ENT_SUBSTITUTE, "UTF-8");
// Visible text: >dlroW< olleH

Reverse the order of words in a sentence

This example reverses the order of words without reversing the letters in each word. A simple split on spaces assumes single-space ASCII text:

$sentence = "PHP is great";
$reversed_words = implode(' ', array_reverse(explode(' ', $sentence)));
echo $reversed_words; 
// Outputs: great is PHP

STRING REFERENCE strlen(): Length of the string

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

About the author Watch on YouTube

Connect:

Subscribe to our YouTube Channel here

huzoor	23-04-2012
Nice Collection.. I feel very happy