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HOME > PHP Manual > mb_convert_case - Perform case folding on a string

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Multibyte String Functions

PHP Manual

mb_convert_case

(PHP 4 >= 4.3.0, PHP 5)

mb_convert_case — Perform case folding on a string

Description

string mb_convert_case ( string $str , int $mode [, string $encoding ] )

Performs case folding on a string, converted in the way specified by mode .

Parameters

str: The string being converted.
mode: The mode of the conversion. It can be one of MB_CASE_UPPER, MB_CASE_LOWER, or MB_CASE_TITLE.
encoding: The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.

Return Values

A case folded version of string converted in the way specified by mode .

Unicode

By contrast to the standard case folding functions such as strtolower() and strtoupper(), case folding is performed on the basis of 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).

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

Examples

Example #1 mb_convert_case() example


<?php
$str = "mary had a Little lamb and she loved it so";
$str = mb_convert_case($str, MB_CASE_UPPER, "UTF-8");
echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
$str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
echo $str; // Prints Mary Had A Little Lamb And She Loved It So
?>

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