How to convert lowercase letters to uppercase in php

php method to convert lowercase letters to uppercase: You can use the strtoupper() function to achieve this. The strtoupper() function can convert a string to uppercase and return the converted string, such as: [strtoupper("Hello WORLD!")].

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

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Grammar:

strtoupper(string)

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Example:

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

Output result:

HELLO WORLD!

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