Show a number to 2 decimal places
What's the correct way to round a PHP string to 2 decimal places?
$number = "520"; // It's a string from a DB
$formatted_number = round_to_2dp($number);
echo $formatted_number;
The output should be 520.00 ;
How should the round_to_2dp() function definition be?
You can use number_format():
return number_format((float)$number, 2, '.', '');
Example:
$foo = "105";
echo number_format((float)$foo, 2, '.', ''); // Outputs -> 105.00
This function returns a string .
或者，
$padded = sprintf('%0.2f', $unpadded); // 520 -> 520.00
Use round() (use if you are expecting number in float format only, else use number_format() as answer given by Codemwnci ):
echo round(520.34345,2); // 520.34
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
?>
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