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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 (ä) will not be converted.

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 ?>`

> 注意: 本函数可安全用于二进制对象。

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

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