PHP | IntlChar::isupper() Function

The IntlChar::isupper() function is an inbuilt function in PHP which is used to check whether the given input character is an uppercase character or not.

Syntax:

bool IntlChar::isupper( $codepoint )

Parameters: This function accepts a single parameter $codepoint which is mandatory. The input parameter is a character, which is encoded as a UTF-8 string.

Return Value: If $codepoint is an uppercase character then it returns True, otherwise return False.

Below programs illustrate the IntlChar::isupper() function in PHP:

Program 1:

PHP

<?php
// PHP code to illustrate IntlChar::isupper()
// function

// Input data is character type
var_dump(IntlChar::isupper("G"));

// Input data is control character
var_dump(IntlChar::isupper("\t"));

// Input data is string type
var_dump(IntlChar::isupper("Geeksforgeeks"));

// Input data is number type
var_dump(IntlChar::isupper("2018"));

// Input data is single digit
var_dump(IntlChar::isupper("5"));

?>

Output:

bool(true) 
bool(false) 
NULL 
NULL 
bool(false) 

Note: If String and Numbers (except single digit number) are used as a parameter then it returns NULL.

Program 2:

PHP

<?php
// PHP code to illustrate IntlChar::isupper()

// Declare an array $arr
$arr = array("A","\u{0041}","@","0","\n","123","Geeks");

// \u{0041} is ASCII value of 'A'

// Loop run for every array element
foreach ($arr as $val){

    // Check each element as code point data
    var_dump(IntlChar::isupper($val));
}
?>

Output:

bool(true) 
bool(true) 
bool(false) 
bool(false) 
bool(false) 
NULL 
NULL 

Reference: http://php.net/manual/en/intlchar.isupper.php