How to convert lowercase letters to uppercase letters in php

How to convert lowercase letters to uppercase letters in php: You can use the strtoupper() function to achieve this. The strtoupper() function can convert a string to uppercase and return the converted string, for example: [strtoupper("Hello World")].

strtoupper() function converts a string to uppercase and returns the string converted to uppercase.

(Recommended tutorial: php graphic tutorial)

Grammar:

strtoupper(string)

Example:

<?php
    echo strtoupper("Hello WORLD!");
?>

(Recommended learning video: php video tutorial)

Similar functions are also:

strtolower() function converts the string to lowercase.

Example:

<?php
    echo strtolower("Hello WORLD.");
?>

The above is the detailed content of How to convert lowercase letters to uppercase letters in php. For more information, please follow other related articles on the PHP Chinese website!