how to convert amount in words in php with code examples

Have you ever needed to convert an amount in numbers to words in your PHP project? If so, you’re not alone. Converting numbers to words can be a painstaking and time-consuming process, but it's a crucial element when you're dealing with financial and monetary products.

In this article, we’ll cover everything you need to know about how to convert amount in words in PHP. So let's get started!

The basic concept of converting amount in words in PHP

There are primarily two different approaches to convert an amount in numbers to words, the first one being a custom function and the second one using a pre-built PHP library. In the first case, you define a function that takes a number as input and returns the equivalent amount in words. In the second case, you use a pre-built library that already includes a function that you can use directly.

The custom function is useful when you're dealing with a small project or when implementing things on your own, while using a pre-built library can be more beneficial for larger projects that are more complicated.

Converting amount to words using custom function

Here’s a sample PHP function that you can use to convert an amount in numbers to words:

function convertToWords($number)
    $words = array(
        0 => 'Zero',
        1 => 'One',
        2 => 'Two',
        3 => 'Three',
        4 => 'Four',
        5 => 'Five',
        6 => 'Six',
        7 => 'Seven',
        8 => 'Eight',
        9 => 'Nine',
        10 => 'Ten',
        11 => 'Eleven',
        12 => 'Twelve',
        13 => 'Thirteen',
        14 => 'Fourteen',
        15 => 'Fifteen',
        16 => 'Sixteen',
        17 => 'Seventeen',
        18 => 'Eighteen',
        19 => 'Nineteen',
        20 => 'Twenty',
        30 => 'Thirty',
        40 => 'Forty',
        50 => 'Fifty',
        60 => 'Sixty',
        70 => 'Seventy',
        80 => 'Eighty',
        90 => 'Ninety',

    if (!is_numeric($number)) {
        return 'Not a valid number';

    if (($number >= 0 && (int) $number < 0) || (int) $number < 0 - PHP_INT_MAX) {
        return 'Number too large to convert to words';

    $add_minus = "";
    if($number < 0) {
        $number *= -1;
        $add_minus = "Minus ";

    $string = $add_minus;
    switch (true) {
        case $number < 21:
            $string .= $words[$number];
        case $number < 100:
            $tens = ((int) ($number / 10)) * 10;
            $units = $number % 10;
            $string .= $words[$tens];
            if ($units) {
                $string .= ' ' . $words[$units];
        case $number < 1000:
            $hundreds = floor($number / 100);
            $remainder = $number % 100;
            $string .= $words[$hundreds] . ' Hundred';
            if ($remainder) {
                $string .= ' ' . convertToWords($remainder);
            $thousands = floor($number / 1000);
            $remainder = $number % 1000;
            $string .= convertToWords($thousands) . ' Thousand';
            if ($remainder) {
                $string .= ' ' . convertToWords($remainder);

    return $string;

The above function takes an integer as input and returns its word value as a string. It first defines a $words array that contains the mappings of number of words. The function then validates the input, first ensuring that it's a valid number, and secondly that it's not too large to convert into words.

After validating the input, it checks the input number against predefined cases to convert into words. If the input number is less than 21, it returns its mapped value from the $words array. If it's between 21 and 99, it computes the tens and units separately and returns their concatenated values in words.

For numbers between 100 and 999, the function computes the hundreds and the remainder separately, and calls itself recursively to get the remainder value returned in words. For the largest number, i.e., above 1000, it calls itself recursively again to convert the thousands value to words and returns the concatenated value with the remainder that is again converted into words.

Converting amount to words using PHP built-in libraries

In addition to the custom function, you can also use third-party libraries. One of the libraries that you can use in PHP is the Numwords library.

Here's how you can use the library in your project:

  1. Install Numwords library using Composer. You would need to run the following command:
composer require imal/handlebars.php
  1. To use the Numwords library in your PHP project, use the following code snippet:
require 'vendor/autoload.php';

use iMall\Numwords\Numwords;

$num = 34;
$numWords = new Numwords();
echo $numWords->toWords($num);


Converting an amount to words in PHP is a simple and straightforward process once you know the basics. You can either create a custom function or use pre-built libraries like the Numwords library. In this article, we have discussed both of these methods along with code examples to help you implement this feature in your PHP project.

Converting an amount to words in PHP is an essential feature that is commonly used in a variety of financial and accounting applications. It helps to prevent errors when interpreting numbers, making it easier to understand the amount being represented.

In the custom function example provided earlier, you can see that we created a series of mappings between numbers and words, with special conditions for certain numbers (e.g., numbers less than 21, 100, and 1000). The function also includes input validation to ensure that the number is valid and not too large to convert into words. Finally, the function uses recursion to handle larger numbers and concatenate the returned values.

Using a third-party library like Numwords may be a quicker and more efficient solution, especially for larger projects. Installation of libraries like Numwords is done through Composer, which automatically manages dependencies and updates. After installation, we used the toWords method of the Numwords library to convert our numbers to words.

In addition to Numwords, PHP has other libraries that convert numbers to words, such as PEAR Numbers_Words and phpNumberSpell.

It's essential to choose the right method for your project based on the scope, dependencies, and complexity. Using a pre-built library may save time, but a custom function gives you full control and customization options.

Overall, converting an amount to words in PHP is a feature that adds value to your financial and accounting applications, reducing errors and improving readability.

Popular questions

  1. What is the purpose of converting an amount to words in PHP?

The purpose of converting an amount to words in PHP is to make it easier to read and interpret the number. This feature is essential in financial and accounting applications, where accuracy and precision are crucial.

  1. What is a custom function in PHP?

A custom function in PHP is a user-defined function that performs a specific task. In the context of converting an amount to words in PHP, a custom function is a function created by the user that takes an amount in numbers as input and returns the equivalent amount in words.

  1. What does Numwords library do in PHP?

Numwords library is a third-party library in PHP that converts a numeric value to its number form in words. It is a powerful library that can handle numbers of any size and can be used to convert both positive and negative numbers to words.

  1. What are some of the input validations done in a custom function for converting amount to words in PHP?

Input validation is done to ensure that the input number is valid and not too large to convert into words in a custom function for converting amount to words in PHP. This includes verifying that the input number is numeric and that it's not too large to be handled safely by the function.

  1. What is the advantage of using a pre-built library over a custom function in PHP for converting amount to words?

Using a pre-built library can save time and reduce complexity when converting an amount to words in PHP. Pre-built libraries like Numwords are already optimized and tested, so you can use them with confidence. On the other hand, a custom function provides more control and customization options. The choice depends on the project requirements and constraints.



As an experienced software engineer, I have a strong background in the financial services industry. Throughout my career, I have honed my skills in a variety of areas, including public speaking, HTML, JavaScript, leadership, and React.js. My passion for software engineering stems from a desire to create innovative solutions that make a positive impact on the world. I hold a Bachelor of Technology in IT from Sri Ramakrishna Engineering College, which has provided me with a solid foundation in software engineering principles and practices. I am constantly seeking to expand my knowledge and stay up-to-date with the latest technologies in the field. In addition to my technical skills, I am a skilled public speaker and have a talent for presenting complex ideas in a clear and engaging manner. I believe that effective communication is essential to successful software engineering, and I strive to maintain open lines of communication with my team and clients.
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