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PHP – Case folding in a string using mb_convert_case()
mb_convert_case() is an inbuilt function in PHP that is used to perform case folding on a given string.
Syntax
string mb_convert_case(str $string, int $mode, str $encoding)
Parameters
mb_convert_case() accepts three parameters: $string, $mode and $encoding to perform case folding on a string.
$string− This parameter is used to return the string being converted.
$mode: The mode parameter is used for the mode of the conversion. It can be used for multibyte string conversion for MB_CASE_UPPER, MB_CASE_LOWER, MB_CASE_TITLE, MB_CASE_FOLD, MB_CASE_UPPER_SIMPLE, MB_CASE_LOWER_SIMPLE, MB_CASE_TITLE_SIMPLE, MB_CASE_FOLD_SIMPLE.
$encoding: This parameter is the character encoding. If it is omitted or null, then the internal character encoding value will be used
Return Values
mb_convert_case() is used to return the string mode of the conversion.
Note: From PHP 7.3.0, some multibyte functions are added as mode, such as MB_CASE_FOLD, MB_CASE_UPPER_SIMPLE, MB_CASE_LOWER_SIMPLE, MB_CASE_TITLE_SIMPLE, and MB_CASE_FOLD_SIMPLE.
Example 1
<?php $string = "Hello World!, Welcome to the online Tutorial"; // convert above string in upper case $string = mb_convert_case($string, MB_CASE_UPPER, "UTF-8"); echo $string; // It will convert given string in lower case $string = mb_convert_case($string, MB_CASE_LOWER, "UTF-8"); echo $string; ?>
Output
HELLO WORLD!, WELCOME TO THE ONLINE TUTORIALhello world!, welcome to the online tutorial
Example 2
<?php $string = "Hello World!, Welcome to the online Tutorial"; // MB_CASE_TITLE is used $string = mb_convert_case($string, MB_CASE_TITLE, "UTF-8"); echo $string; // MB_CASE_UPPER_SIMPLE convert string in upper case $string = mb_convert_case($string, MB_CASE_UPPER_SIMPLE, "UTF-8"); echo $string; ?>
Output
Hello World!, Welcome To The Online TutorialHELLO WORLD!, WELCOME TO THE ONLINE TUTORIAL
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