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(PHP 4 >= 4.3.0, PHP 5)

mb_strtolower - Make a string lowercase


string mb_strtolower ( string str [, string encoding] )

mb_strtolower() returns str with all alphabetic characters converted to lowercase.

encoding specifies the encoding of str; if omitted, the internal character encoding value will be used.

For more information about the Unicode properties, please see http://www.unicode.org/unicode/reports/tr21/.

By contrast to strtolower(), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as A-umlaut ().

Пример 1. mb_strtolower() example
$str = "Mary Had A Little Lamb and She LOVED It So";
$str = mb_strtolower($str);
echo $str; // Prints mary had a little lamb and she loved it so

Смотрите также strtolower(), mb_strtoupper() and mb_convert_case().

Описание на ru2.php.net
Описание на php.ru