strtoupper

Description

Returns string with all alphabetic characters converted to uppercase.

Note that 'alphabetic' is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (д) will not be converted.

$str = "Mary Had A Little Lamb and She LOVED It So";
$str = strtoupper($str);
print $str; # Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO

See also strtolower(), ucfirst(), and ucwords().