PHP – Change case of string

In this post we will be creating a PHP script that will change the case of an existing string. To do this we will be using the following functions.

1. strtolower() – This function makes a string lowercase.
2. strtoupper() – This function makes a string uppercase.

See the below snippet of code which will change the case of our string to all lowercase. This would return ‘she sells seashells by the seashore’ as output

Lowercase.php

<?php
$str = "She Sells Seashells By The Seashore";
$str = strtolower($str);
echo $str;
?>

See the snippet of code below which changes the case of our string to all uppercase. This would return ‘SHE SELLS SEASHELLS BY THE SEASHORE’ as output

Uppercase.php

<?php
$str = "She Sells Seashells By The Seashore";
$str = strtoupper($str);
echo $str; 
?>