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 (ä) will not be converted.

Returns the uppercased string.

• Main PHP Function Online page
• strtolower() - Make a string lowercase
• ucfirst() - Make a string's first character uppercase
• ucwords() - Uppercase the first character of each word in a string
• mb_strtoupper() - Make a string uppercase