Reverse String Without Using Any Function in PHP

Reversing a string in PHP is completely simple to use inbuild function “strrev()”. However often you may consider the task of reversing a string in PHP without using the “strrev()” function in PHP interview. You can reverse string without using any function in PHP easily.

The following are the steps:

Logic:

Take three variables first for a string which you have to convert “$string”, the second variable will be stored the reverse string “$reverce” and third will interact each character of the string $i
Check the empty string in while loop
Concatenate the string inside the while loop and store the the value like “$reverse = $string[$i].$reverse;”
Print or display the reversed($reverse) string out site the while loop.

Let’s take an example to understand:

 <?php $string = 'john'; $reverse = ''; $i = 0; while(!empty($string[$i])){ $reverse = $string[$i].$reverse; $i++; } echo $reverse; ?>

<?php

$string = 'john';

$reverse = '';

$i = 0;

while(!empty($string[$i])){

$reverse = $string[$i].$reverse;

$i++;

}

echo $reverse;

Output: The above code did reverse the string to ‘nhoj’.

 nhoj

nhoj

Reverse String Without Using Any Function using HTML Form:

You can follow the steps to use this code:

Copy the below-mentioned code.
Create a file into your webserver and paste the copied code.
Open the created file on the browser.
There will be shown an input box.
Enter your string and click on the “Submit” button.
After clicking the button, there will be shown output above the text box.

 <!DOCTYPE html> <html> <head> <title>Reverse a string without using any php function</title> </head> <body> <?php if(isset($_GET['submit'])){ $string = $_GET['string']; $reverse = ''; $i = 0; while(!empty($string[$i])){ $reverse = $string[$i].$reverse; $i++; } echo $reverse; } ?> <form action="" method="get"> <input type="text" name="string" placeholder="Enter String" required><br><br> <input type="Submit" value="Submit" name="submit"> </form> </body> </html>

<!DOCTYPE html>

<html>

<head>

<title>Reverse a string without using any php function</title>

</head>

<body>

<?php

if(isset($_GET['submit'])){

$string = $_GET['string'];

$reverse = ''; $i = 0;

while(!empty($string[$i])){

$reverse = $string[$i].$reverse;

$i++;

}

echo $reverse;

}

</form>

</body>

</html>

You can check the YouTube video of “Reverse String Without Using Any Function in PHP”.

Reverse String Without Using Any Function using HTML Form:

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