PHP 手冊
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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.

示範 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 ?>`

> 備注:這個函數可安全的使用於二進位。

See also strtoupper(), ucfirst(), ucwords() and mb_strtolower().

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