PHP Program to Count Digits of a Number

In this article, we will see how to count the digits of a number in PHP. There are three methods to count digits of a number, these are:

Using strlen() Function

The strlen() function returns the length of a given string. It takes a string as a parameter and returns it’s length. It calculates the length of the string including all the whitespaces and special characters.

Syntax:

strlen( $string );

Example:

PHP

<?php

$numStr1 = '110010';
$digitCount1 = strlen($numStr1);
echo "String Length: " . $digitCount1;

$number = 12345;
$numStr2 = (string)$number;
$digitCount2 = strlen($numStr2);
echo "\nString Length: " . $digitCount2;

?>

Output

String Length: 6
String Length: 5

Using while Loop

In this section, we use while loop to count the digits of a Number. First, we declare a counter variable and initialize with 0. Then check the given number is not equal to zero, then divide the number by 10, and increase the counter variable by 1. At last, return the counter variable that display the total digits of a number.

PHP

<?php

function countDigits($number) {
    $digitCount = 0;
    while ($number != 0) {
        $number = (int)($number / 10);
        $digitCount++;
    }
    return $digitCount;
}

$numStr = '110010';
$digitCount1 = countDigits($numStr);
echo "String Length: " . $digitCount1;

$number = 12345;
$digitCount2 = countDigits($number);
echo "\nString Length: " . $digitCount2;

?>

Output

String Length: 6
String Length: 5

Using str_split() Function

The str_split() function converts the given string into an array, and then use count() function to count total number of digits in given number.

Example:

PHP

<?php

function countDigits($number) {
    $digits = str_split($number);
    $digitCount = count($digits);
    return $digitCount;
}

$numStr = '110010';
$digitCount1 = countDigits($numStr);
echo "String Length: " . $digitCount1;

$number = 12345;
$digitCount2 = countDigits((string)$number);
echo "\nString Length: " . $digitCount2;

?>

Output

String Length: 6
String Length: 5