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 $formatted_number;
The output should be 520.00;
How should the round_to_2dp() function definition be?
转载于:https://stackoverflow.com/questions/4483540/show-a-number-to-2-decimal-places
You can use number_format():
return number_format((float)$number, 2, '.', '');
Example:
$foo = "105";
echo number_format((float)$foo, 2, '.', ''); // Outputs -> 105.00
This function returns a string.
http://php.net/manual/en/function.round.php
e.g.
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
Use PHP number_format() function.
round_to_2dp is an user defined function, nothing can be done unless you posted the declaration of that function
However, my guess is doing this number_format($number,2);
Alternatively,
$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
valto specifiedprecision(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 ?>
Try:
$number = 1234545454;
echo $english_format_number = number_format($number, 2);
The output will be:
1,234,545,454.00
I make my own.
$decimals = 2;
$number = 221.12345;
$number = $number * pow(10,$decimals);
$number = intval($number);
$number = $number / pow(10,$decimals);
You can use PHP round() function.
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
You can use php printf or sprintf functions:
example with sprintf:
$num = 2.12;
echo sprintf("%.3f",$num);
You can run same without echo as well, ex: sprintf("%.3f",$num);
output:
2.120
Alternatively, with printf:
echo printf("%.2f",$num);
output:
2.124
Number without round
$double = '21.188624';
echo intval($double).'.'.substr(end(explode('.',$double)),0,2);
$retailPrice = 5.989;
echo number_format(floor($retailPrice*100)/100,2, '.', '');
It will return 5.98 without rounding the number.
$number = sprintf('%0.2f', $numbers); // 520.89898989 -> 520.89
This will give you 2 number after decimal.
$twoDecNum = sprintf('%0.2f', round($number, 2));
The rounding correctly rounds the number and the sprintf forces it to 2 decimal places if it happens to to be only 1 decimal place after rounding.
bcdiv($number, 1, 2) //2 varies for digits after decimal
This will display exactly two digits after decimal.
Advantage: If you want to display two digits after float value only and not for int then use this.
Here I getting 2 decimal after .(dot) using function..
function truncate_number( $number, $precision = 2) {
// Zero causes issues, and no need to truncate
if ( 0 == (int)$number ) {
return $number;
}
// Are we negative?
$negative = $number / abs($number);
// Cast the number to a positive to solve rounding
$number = abs($number);
// Calculate precision number for dividing / multiplying
$precision = pow(10, $precision);
// Run the math, re-applying the negative value to ensure returns correctly negative / positive
return floor( $number * $precision ) / $precision * $negative;
}
Results from the above function:
echo truncate_number(2.56789, 1); // 2.5
echo truncate_number(2.56789); // 2.56
echo truncate_number(2.56789, 3); // 2.567
echo truncate_number(-2.56789, 1); // -2.5
echo truncate_number(-2.56789); // -2.56
echo truncate_number(-2.56789, 3); // -2.567
New Correct Answer
Use the PHP native function bcdiv
echo bcdiv(2.56789, 1, 1); // 2.5
echo bcdiv(2.56789, 1, 2); // 2.56
echo bcdiv(2.56789, 1, 3); // 2.567
echo bcdiv(-2.56789, 1, 1); // -2.5
echo bcdiv(-2.56789, 1, 2); // -2.56
echo bcdiv(-2.56789, 1, 3); // -2.567
Another more exotic way to solve this issue is to use bcadd() with a dummy value for the $right_operand of 0.
$formatted_number = bcadd($number, 0, 2);
If you want to use 2 decimal digit in your entire project you can define
bcscale(2);
Then the following function will produce your desired result
$myvalue=10.165445;
echo bcadd(0,$myvalue);
//result=10.11
But if you don't use bcscale function you need to write the code as follow to get your desire result
$myvalue=10.165445;
echo bcadd(0,$myvalue,2);
//result=10.11
To know more
Use PHP number_format() function. e.g.
$num = 7234545423;
echo number_format($num, 2);
The output will be:
7,234,545,423.00
For conditional rounding off ie. show decimal where it's really needed otherwise whole number
123.56 => 12.56
123.00 => 123
$somenumber = 123.56;
$somenumber = round($somenumber,2);
if($somenumber == intval($somenumber))
{
$somenumber = intval($somenumber);
}
echo $somenumber; // 123.56
$somenumber = 123.00;
$somenumber = round($somenumber,2);
if($somenumber == intval($somenumber))
{
$somenumber = intval($somenumber);
}
echo $somenumber; // 123