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PHP | IntlChar foldCase() Function
  • Difficulty Level : Easy
  • Last Updated : 27 Aug, 2019

The IntlChar::foldCase() function is an inbuilt function in PHP which is used to perform case folding on a code point. Case folding means the given character is mapped to its equivalent lowercase characters.

Syntax:

mixed IntlChar::foldCase( $codepoint, $options = 
IntlChar::FOLD_CASE_DEFAULT )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $codepoint: This parameter is a character or interger value, which is encoded as a UTF-8 string.
  • $options: This parameter holds the character constants IntlChar::FOLD_CASE_DEFAULT by default or IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I.

Return Value: This function returns Simple_Case_Folding of the codepoint. If the codepoint has no case folding equivalent, then the codepoint itself is returned.

Below program illustrates the IntlChar::foldCase() function in PHP:



Program:

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<?php
// PHP program to illustrate the IntlChar::foldCase() function
  
var_dump(IntlChar::foldCase('AA', IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I));
  
var_dump(IntlChar::foldCase('@', IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I));
  
var_dump(IntlChar::foldCase('&', IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I));
  
var_dump(IntlChar::foldCase('C', IntlChar::FOLD_CASE_DEFAULT));
  
var_dump(IntlChar::foldCase('Lt', IntlChar::FOLD_CASE_DEFAULT));
  
var_dump(IntlChar::foldCase('/', IntlChar::FOLD_CASE_DEFAULT));
  
var_dump(IntlChar::foldCase('g', IntlChar::FOLD_CASE_DEFAULT));
  
var_dump(IntlChar::foldCase('1', IntlChar::FOLD_CASE_DEFAULT));
  
?>

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Output:

NULL
string(1) "@"
string(1) "&"
string(1) "c"
NULL
string(1) "/"
string(1) "g"
string(1) "1"

Reference: https://www.php.net/manual/en/intlchar.foldcase.php

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