PHP | IntlChar::isalnum () Function

The IntlChar::isalnum() function is an inbuilt function in PHP which is used to check the given input is an alphanumeric character (Digit or Letter) or not. It returns TRUE for characters with general categories “L” (letters) and “Nd” (decimal digit numbers).

Syntax:

bool IntlChar::isalnum( $codepoint )

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

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

Program 1:

PHP

<?php

// PHP code to illustrate IntlChar::isalnum()
// Function

// Input data is character type
var_dump(IntlChar::isalnum("D"));

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

// Input data is integer type
var_dump(IntlChar::isalnum("234"));

// Input data is special character type
var_dump(IntlChar::isalnum("*"));

?>

Output: 

bool(true) 
NULL 
NULL 
bool(false) 

Program 2:

PHP

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

// Declare an array $arr
$arr = array("4", "20001111", "^", "  ", "*", "GeeksforGeeks");

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

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

Output: 

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

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