PHP Functions Essential Reference

strtoupper

string strtoupper(string string) 

Convert a string to uppercase.

Returns:

Uppercase string

Description:

strtoupper() converts all lowercase alphabetical characters within a string to their uppercase equivalents.

Note:

The conversion from lowercase to uppercase is dependent upon the current locale. Use setlocale() to set or query the locale.

Version:

PHP 3+, PHP 4+

See also:

To alter the case of a string:

strtolower() 
ucfirst() 
ucwords() 

Example:

Make a string uppercase

<?php $email_subject = "Hello, my name is loud howard."; echo strtoupper ($email_subject); ?> Output: HELLO, MY NAME IS LOUD HOWARD.