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The strtoupper Function

The strtoupper function converts a string to uppercase. It works correctly only with Latin characters (single-byte characters).

Syntax

strtoupper(string $string): string

Example

Let's convert a string to uppercase:

<?php
	echo strtoupper('abcde');
?>

Code execution result:

'ABCDE'

See Also

the strtolower function,
which converts a string to lowercase
the ucfirst function,
which converts the first character to uppercase
the lcfirst function,
which converts the first character to lowercase
the ucwords function,
which converts the first letters of words to uppercase

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