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PHP | IntlChar::islower() Function
  • Last Updated : 27 Aug, 2019

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

Syntax:

bool IntlChar::islower( $codepoint )

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

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

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



Program 1:

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<?php
// PHP code to illustrate IntlChar::islower()
// function
    
// Input data is character type
var_dump(IntlChar::islower("a"));
var_dump(IntlChar::islower("A"));
var_dump(IntlChar::islower("\u{0041}"));
   
// Input data is control character
var_dump(IntlChar::islower("\t"));
   
// Input data is string type 
var_dump(IntlChar::islower("Geeksforgeeks"));
    
// Input data is number type
var_dump(IntlChar::islower("2018"));
    
// Input data is single digit
var_dump(IntlChar::islower("5"));
  
?>

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Output:

bool(true) 
bool(false) 
bool(false) 
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:

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<?php
// PHP code to illustrate IntlChar::islower()
       
// Declare an array $arr
$arr = array("a", "\u{FF41}", "A", "\u{0041}", "0", "\n", "123", "Geeks");
  
// \u{0041} is ASCII value of 'A'
// \u{FF41} 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::islower($val));
}
?>

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Output:

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

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




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