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# strtolower

(PHP 3, PHP 4, PHP 5)

strtolower -- Make a string lowercase

## Description

string strtolower ( string str )

Returns `string` with all alphabetic characters converted to lowercase.

Note that 'alphabetic' is determined by the current locale. This means that in i.e. the default "C" locale, characters such as umlaut-A (Ä) will not be converted.

例 1. strtolower() example

`<?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = strtolower($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 strtoupper(), ucfirst(), ucwords() and mb_strtolower().

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