PHP 手冊
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# strtoupper

(PHP 3, PHP 4 , PHP 5)

strtoupper -- Make a string uppercase

## Description

string strtoupper ( string string)

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 (� will not be converted.

示範 1.strtoupper() example
`<?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = strtoupper($str); echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO ?>`

> 備注:這個函數可安全的使用於二進位。

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

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