JIYIK CN >

This article will cover different ways to format numbers as dollar amounts in PHP with examples. These include:

• number_format
• NumberFormatter::formatCurrency
• Regular expressions
• Manual format

We'll also look at why money_formatthe function is no longer used.

Use the function in PHP number_formatto format a number as a dollar amount

We use number_formatthe function to round a value in thousands while adding decimal places and currency type.

This function has four parameters:

number_format(NUMBER, DECIMAL DIGITS, THOUSANDS SEPARATOR, DECIMAL SEPARATOR)

• number is the value to be formatted.
• Decimal places specifies the number of decimal places.
• Decimal separator identifies the string used for the decimal point.
• Thousands separator indicates the string used as the thousands separator.

It's worth noting that if the thousands separator parameter is in use, the other three must accompany it in order for your code to work.

Sample code:

<?php

//  NUMBER
$amount = 123.45;

//  TO USD - $123.45
$usd = "$" . number_format($amount, 2, ".");
echo $usd;
?>

Output:

$123.45

Use the function in PHP NumberFormatter::formatCurrencyto format a number as a dollar amount

This is the newest and arguably simplest way to format numbers into strings displaying different currencies.

Make sure php.iniit is enabled in extension=intl.

There are three parameters you should remember:

• A formatter, a NumberFormatterobject.
• Amount, i.e. digital currency value.
• The currency used is specified by ISO 4217.

Sample code:

<?php
// NUMBER
$amount = 123;

// TO USD - $123.00
$fmt = new NumberFormatter("en_US",  NumberFormatter::CURRENCY);
$usd = $fmt->formatCurrency($amount, "USD");
echo $usd;
?>

Output:

$123.00

Example 2:

<?php
// NUMBER
$amount = 123.456;

// TO USD - $123.46
$fmt = new NumberFormatter("en_US",  NumberFormatter::CURRENCY);
$usd = $fmt->formatCurrency($amount, "USD");
echo $usd;
?>

Output:

$123.46

正则表达式Formatting numbers as dollar amounts in PHP

This approach is a whole can of worms. Going into the details of it will only confuse you.

This method rounds the number up to thousands while adding the currency symbol of your choice.

Let’s look at an example:

<?php
// NUMBER
$amount = 0.13;

// REGULAR EXPRESSION
$regex = "/\B(?=(\d{3})+(?!\d))/i";
$usd = "$" . preg_replace($regex, ",", $amount);
echo $usd;
?>

Output:

$0.13

Manually formatting a number as a dollar amount in PHP

This method is equivalent to picking the lock by brute force. This method allows you to use any format you want.

Let’s look at an example:

<?php
// FOR A DOLLAR CURRENCY
function curformat ($amount) {
  //  SPLIT WHOLE & DECIMALS
  $amount = explode(".", $amount);
  $whole = $amount[0];
  $decimal = isset($amount[1]) ? $amount[1] : "00" ;

  //  ADD THOUSAND SEPARATORS
  if (strlen($whole) > 3) {
    $temp = ""; $j = 0;
    for ($i=strlen($whole)-1; $i>=0; $i--) {
      $temp = $whole[$i] . $temp;
      $j++;
      if ($j%3==0 && $i!=0) { $temp = "," . $temp; }
    }
    $whole = $temp;
  }

  //  RESULT
  return "\$$whole.$decimal";
}

//  UNIT TEST
echo curformat(100); // $100.00

Output:

$100.00

The above method should format the number into a string showing dollars and cents.

There is another money_formatmethod called , but it does not work on Windows. We strongly recommend that you do not use this function as it is deprecated.