PHP: mb_strtolower - Manual

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Last updated: Sat, 27 Jan 2007

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# mb_strtolower

(PHP 4 >= 4.3.0, PHP 5)

mb_strtolower -- Make a string lowercase

## Description

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 (Ä).

Пример 1. mb_strtolower() example

`<?php $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 ?>`

See also strtolower(), mb_strtoupper() and mb_convert_case().

add a note User Contributed Notes
mb_strtolower
btherl at yahoo dot com dot au
15-Nov-2005 09:12
`If you use this function on a unicode string without telling PHP that it is unicode, then you will corrupt your string. In particular, the uppercase 'A' with tilde, common in 2-byte UTF-8 characters, is converted to lowercase 'a' with tilde.
This can be handled correctly by:
$str = mb_strtolower($str, mb_detect_encoding($str));
Or if you know your data is UTF-8, just use the string "UTF-8" as the second argument.
You should check also that mb_detect_encoding() is checking the encodings you want it to check, and is detecting the correct encodings.`
add a note
mb_strtoupper mb_strstr

Last updated: Sat, 27 Jan 2007
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