Find First and Last Digits of a Number in PHP Last Updated : 12 Dec, 2023 Comments Improve Suggest changes Like Article Like Report Given a Number, the task is to find the first, and last digits of a number using PHP. Examples: Input: num = 145677Output: First Digit: 1, and Last Digit: 7Input: 101130Output: First Digit: 1, and Last Digit: 0There are three methods to get the first and last digit of number, these are: Table of Content Using LoopUsing LogarithmUsing str_split() FunctionUsing LoopIn this section, we use while loop to get the first and last digit of number. Remainder operator is used to get the last digit of number, and for first digit, use while loop. PHP <?php function firstAndLastDigits($number) { $lastDigit = $number % 10; while ($number >= 10) { $number = (int)($number / 10); } $firstDigit = $number; return [$firstDigit, $lastDigit]; } $num = 12345; list($firstDigit, $lastDigit) = firstAndLastDigits($num); echo "First Digit: $firstDigit, Last Digit: $lastDigit"; ?> OutputFirst Digit: 1, Last Digit: 5 Using LogarithmHere, we use Logarithm to get the first digit of number. To get the first digit, divide the number by 10 power length of given number i.e. $number / pow(10, $len). Example: PHP <?php function firstAndLastDigits($number) { $len = floor(log10($number)); $firstDigit = (int)($number / pow(10, $len)); $lastDigit = $number % 10; return [$firstDigit, $lastDigit]; } $num = 12345; list($firstDigit, $lastDigit) = firstAndLastDigits($num); echo "First Digit: $firstDigit, Last Digit: $lastDigit"; ?> OutputFirst Digit: 1, Last Digit: 5 Using str_split() FunctionIn this section, first, we convert the number of string and then split into an array, then get the first and last element of array. PHP <?php function firstAndLastDigits($number) { $arr = str_split((string)$number); $firstDigit = $arr[0]; $lastDigit = $arr[sizeof($arr)-1]; return [$firstDigit, $lastDigit]; } $num = 12345; list($firstDigit, $lastDigit) = firstAndLastDigits($num); echo "First Digit: $firstDigit, Last Digit: $lastDigit"; ?> OutputFirst Digit: 1, Last Digit: 5 Comment More infoAdvertise with us Next Article PHP Syntax B blalverma92 Follow Improve Article Tags : PHP Geeks Premier League 2023 Similar Reads PHP Tutorial PHP is a popular, open-source scripting language mainly used in web development. It runs on the server side and generates dynamic content that is displayed on a web application. PHP is easy to embed in HTML, and it allows developers to create interactive web pages and handle tasks like database mana 9 min read BasicsPHP SyntaxPHP, a powerful server-side scripting language used in web development. 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