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.

範例 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 ?>`

> 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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