We will look at some of the basic string functions here first , we will cover the changing of case of a string or part of a string . Here are the fuctions that we will cover.

strtolower() : This converts a string to lower case

strtoupper() : This converts a string to upper case

ucfirst() : This capitalizes the first letter of a string as long as it is alphabetic

ucwords() : This capitalizes the first letter of each word in a string that begins with an alphabetic letter

Lets look at an example that demonstartes these functions.

<?php
$test_string = "This is our TEST string";
echo $test_string . "<br>"; //test string
echo strtolower($test_string) . "<br>"; // convert to lower case
echo strtoupper($test_string) . "<br>"; //convert to upper case
echo ucfirst($test_string) . "<br>"; //first letter in string capitalized
echo ucwords($test_string) . "<br>"; //first letter in each word capitalized
?>