PHP | IntlChar::isalnum () Function Last Updated : 05 Feb, 2021 Comments Improve Suggest changes Like Article Like Report 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 Related Articles: PHP | IntlChar::isalpha() FunctionPHP | IntlChar::isdigit() FunctionPHP | IntlChar::isblank() FunctionPHP | IntlChar::isbase() Function Reference: http://php.net/manual/en/intlchar.isalnum.php Comment More infoAdvertise with us Next Article PHP | IntlChar::isalnum () Function jit_t Follow Improve Article Tags : Web Technologies PHP PHP-function Similar Reads PHP | IntlChar::isalpha() Function The IntlChar::isalpha() function is an inbuilt function in PHP which is used to check the given input is an alphanumeric character or not. 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