PHP | IntlChar digit() function

The IntlChar::digit() function is an inbuilt function in PHP which is used to get the decimal digit value of a code point for a given radix. This function returns the decimal digit value of the code point in the specified radix.

Syntax:

int IntlChar::digit( $codepoint, $radix )

Parameters: This function accepts two parameters as mentioned above and described below:

• $codepoint: The value of $codepoint is an integer or character, which is encoded as a UTF-8 string.
• $radix: It is optional parameter. Its default value is 10.

Return Value: This function returns the number represented by the character in the given radix, or False if there is no value or if the value exceeds the radix.

Note: Valid and invalid function argument:

• If both $radix or $digit is not valid then return NULL.
• The $radix argument is valid if its value lies between $radix >= 2 and $radix
• The digit is valid if its value is 0
• The character has a decimal digit value. This characters comes under general category Nd(decimal digit numbers) and a Numeric_Type of Decimal.
• The character is uppercase Latin letters in between ‘A’ to ‘Z’. Then the value of character is c-‘A’+10.
• The character is lowercase Latin letters in between ‘a’ to ‘z’. Then the value of character is ch-‘a’+10.
• Latin letters from both the ASCII range (0061..007A, 0041..005A) as well as from the Full width ASCII range (FF41..FF5A, FF21..FF3A) are recognized.

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

Program 1:

<?php

// PHP code to illustrate IntlChar::digit()
// function

// Input data is single digit
var_dump(IntlChar::digit("6"));

// Input data is single digit
var_dump(IntlChar::digit("3"));

// Input data is character type
var_dump(IntlChar::digit("A"));

// // Input data is character type with base
var_dump(IntlChar::digit("P", 16));

// // Input data is character type with base
var_dump(IntlChar::digit("9", 2));
?>

Output:

int(6)
int(3)
bool(false)
bool(false)
bool(false)

Program 2:

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

// Declare an array $arr
$arr = array("G", "GeeksforGeeks", "^", "1001", "6", "\n",
                                             "\n\n", "\t");

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

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

Output:

bool(false)
NULL
bool(false)
NULL
int(6)
bool(false)
NULL
bool(false)

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