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 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 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 

Related Articles: 

• PHP | IntlChar::isdigit() Function
• PHP | IntlChar::isalnum () Function
• PHP | IntlChar::isalpha() Function

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