PHP value rounding error

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I have a problem, after assigning to a variable a float value as below, 4.85, after multiplying by 100, 48500 and when I print out the value of 00000000484.

$variavel = 4.85;
$valor = $variavel * 100;
echo sprintf("%011d",$valor);
php float int

2 answers

4


If you make a var_dump($valor); the result will be :

float(485)

This is because you are using in the function sprintf the d and you should use f, because the variable $valor is a float.

d - The argument is treated as a whole, and shown as a decimal number down-low.

f - The argument is treated as a float, and shown as a floating point number (from the locale).

F - the argument is treated as a float, and shown as a floating point number (locale not used). Available since PHP 4.3.10 and PHP 5.0.3.

You can also use the function number_format to pass the variable $valor for whole, once this meets as float and keep your code:

$variavel = 4.85;
$valor = $variavel * 100;
$valor = number_format( $valor);
echo sprintf("%011d",$valor);

Sources: Manual sprintf; reply SOEN

  • But look at the following situation, I’m turning a float into an int, since it multiplies 4.85 by 100 and so becomes 48500, if he only takes the whole part would take the value of 48500.00 ? Really this way I managed to solve the problem but this doubt was in the head...,

  • If you make a var_dump($valor); the result will be float(485). So you have to turn first into an integer.

  • You can also use the $valor = number_format( $valor); and keep your code. to format to whole.

  • @Marcoandré Updated response.

  • 1

    Thanks @Jorge B. already changed my code I’m using sprintf("%011.0f",$value);, is for an archive layout for integration, thanks for the help and attention !!

2

There are more specific functions for you to work with rounded php numbers.

Round up values:

<?php 
    echo ceil(9.3);
    // saída = 10
?>

Round down values:

<?php 
    echo floor(9.6);
    // saída = 9
?>

Automatic rounding:

<?php 
    echo round(9.3);
    // saída = 9
    echo round(9.6);
    // saída = 10
?>

Use the shape that best fits your project.

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