Strtoupper()

Introduction

The strtoupper() function in PHP is used to convert all the lowercase letters in a string to uppercase. This function is particularly useful when working with text-based applications where case sensitivity is important. In this article, we will discuss the strtoupper() function in detail and how it can be used in PHP.

Understanding the strtoupper() function

The syntax for using the strtoupper() function in PHP is as follows:

strtoupper(string $str) : string

Here, $str is the string that we want to convert to uppercase. The strtoupper() function returns the uppercase version of the string.

Example Usage

Here is an example usage of the strtoupper() function in PHP:

<?php

$string = "Hello World!";
$uppercase_string = strtoupper($string);
echo $uppercase_string;

Try it Yourself »

In the example above, we define a string $string with mixed case letters. We use the strtoupper() function to convert all the lowercase letters in the string to uppercase. We then print out the uppercase version of the string.

Conclusion

The strtoupper() function in PHP is a useful tool for converting all lowercase letters in a string to uppercase. It is particularly useful when working with text-based applications where case sensitivity is important. By understanding how to use the strtoupper() function, developers can create more efficient and effective PHP applications.