Show a number to two decimal places

Question

Show a number to two decimal places

Question

What's the correct way to round a PHP string to two decimal places?

$number = "520"; // It's a string from a database

$formatted_number = round_to_2dp($number);

echo $formatted_number;

The output should be 520.00;

How should the round_to_2dp() function definition be?

Rich Bradshaw

2019/09/07

Read less…

Use round() (use if you are expecting a number in float format only, else use number_format() as an answer given by Codemwnci):

echo round(520.34345, 2);   // 520.34
echo round(520.3, 2);       // 520.3
echo round(520, 2);         // 520

From the manual:

Description:
float round(float $val [, int $precision = 0 [, int $mode = PHP_ROUND_HALF_UP ]]);
Returns the rounded value of val to specified precision (number of digits after the decimal point). precision can also be negative or zero (default).

...

Example #1 `round()` examples

<?php
    echo round(3.4);         // 3
    echo round(3.5);         // 4
    echo round(3.6);         // 4
    echo round(3.6, 0);      // 4
    echo round(1.95583, 2);  // 1.96
    echo round(1241757, -3); // 1242000
    echo round(5.045, 2);    // 5.05
    echo round(5.055, 2);    // 5.06
?>

Example #2 mode examples

<?php
    echo round(9.5, 0, PHP_ROUND_HALF_UP);   // 10
    echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
    echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
    echo round(9.5, 0, PHP_ROUND_HALF_ODD);  // 9

    echo round(8.5, 0, PHP_ROUND_HALF_UP);   // 9
    echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8
    echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8
    echo round(8.5, 0, PHP_ROUND_HALF_ODD);  // 9
?>

Somnath Muluk

2019/10/14

Alternatively,

$padded = sprintf('%0.2f', $unpadded); // 520 -> 520.00

Marc B

2010/12/19

http://php.net/manual/en/function.round.php

e.g.

echo round(5.045, 2);    // 5.05

echo round(5.055, 2);    // 5.06

SystemX17

2014/01/31

Try:

$number = 1234545454; 
echo  $english_format_number = number_format($number, 2);

The output will be:

1,234,545,454.00

Biju

2013/01/11

You can use the PHP printf or sprintf functions:

Example with sprintf:

$num = 2.12;
echo sprintf("%.3f", $num);

You can run the same without echo as well. Example: sprintf("%.3f", $num);

Output:

2.120

Alternatively, with printf:

echo printf("%.2f", $num);

Output:

2.124

Aditya P Bhatt

2019/09/07

Codemwnci · Accepted Answer · 12/18/2013 7:58:26 AM

Accepted Answer

You can use number_format():

return number_format((float)$number, 2, '.', '');

Example:

$foo = "105";
echo number_format((float)$foo, 2, '.', '');  // Outputs -> 105.00

This function returns a string.

Codemwnci

2013/12/18