How to Keep Two Decimal Places in PHP Using round(), sprintf() and number_format()

The article explains how to retain two decimal places in PHP, presenting three common methods: using round() for rounding, sprintf() for string formatting, and number_format() for number formatting with optional thousand separators.

$num = 10.4567;
// Method 1: round()
echo round($num, 2); // 10.46

// Method 2: sprintf()
$format_num = sprintf("%.2f", $num);
echo $format_num; // 10.46

// Method 3: number_format()
echo number_format($num, 2); // 10.46
// Alternative call
echo number_format($num, 2, '.', ''); // 10.46 (no thousands separator)

It then introduces the number_format() function, which can format numbers with thousands grouping. The syntax is:

number_format(number, decimals, decimalpoint, separator)

Parameters: number: required, the number to format. decimals: optional, number of decimal digits. decimalpoint: optional, string used as decimal point. separator: optional, string used as thousands separator.

Example: formatting product prices in yuan with two decimal places.

<?php
$a = 10;
echo number_format($a, '2');

$b = 1000000;
echo number_format($b, '2');

$c = 5458.5684;
echo number_format($c, '2');

$d = '1254.8963';
echo number_format($d, '2');

$e = '88.9643';
echo number_format($e, '2');
?>

Output:

10.00
1,000,000.00
5,458.57
1,254.90
88.96

Key observations:

Both numeric and string representations of numbers can be processed by number_format().

If the integer part lacks decimals, the function pads with zeros when a decimal count is specified.

When decimals are present, the function rounds the value to the nearest digit.

Without specifying the third and fourth arguments, the function inserts commas as thousands separators for numbers with more than three digits.

Customizing separators:

<?php
echo number_format("1000000", 2, ".", ""); // 1000000.00

echo number_format("1000000", 2, ".", "x"); // 1x000x000.00

echo number_format("1000000", 2, "y", "x"); // 1x000x000y00
?>

Output:

1000000.00
1x000x000.00
1x000x000y00

Additional notes: the third and fourth parameters of number_format() must be used together; they allow changing the decimal point character and the thousands separator respectively.

Finally, the article lists several recommended PHP learning resources, such as Vue3+Laravel8+Uniapp tutorials, Vue3+TP6+API e‑commerce development courses, Swoole training, and Workerman+TP6 instant‑messaging system tutorials.