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PHP | IntlChar foldCase() Function

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  • Difficulty Level : Easy
  • Last Updated : 25 Mar, 2021
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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.

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

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

  • $codepoint: This parameter is a character or integer 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:


// 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));


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



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