PHP Australia Conference 2015

abs

(PHP 4, PHP 5)

absValor absoluto

Descripción

number abs ( mixed $number )

Devuelve el valor absoluto de number.

Parámetros

number

Valor decimal a convertir

Valores devueltos

El valor absoluto de number. Si el argumento number es del tipo float, el valor devuelto es también del tipo float, siendo para los otros casos del tipo integer (debido a que float tiene normalmente un rango de valores mayor que integer).

Ejemplos

Ejemplo #1 Ejemplo de abs()

<?php
echo abs(-4.2); // 4.2 (double/float)
echo abs(5);    // 5 (integer)
echo abs(-5);   // 5 (integer)
?>

Ver también

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User Contributed Notes 3 notes

up
-7
alex.khimich.org
11 months ago
Few ways to convert values to negative
<?php

// Multiplying by "-1"
$v = -1 * abs($v);

// Using ternary operator
$v = $v <= 0 ? $v : -$v;

?>
up
-7
Ister
6 years ago
[*EDIT* by danbrown AT php DOT net: Merged user's corrected code with previous post content.]


jeremys indicated one thing - there is no sgn function wich actually seems a bit strange for me. Of course it is as simple as possible, but it is usefull and it is a standard math function needed occasionally.

Well, I have solved this function in a bit different matter:

<?php

function sgn($liczba)
{
    if(
$liczba>0)
       
$liczba=1;
    else if(
$liczba<0)
       
$liczba=-1;
    else if(!
is_numeric($liczba))
       
$liczba=null;
    else
       
$liczba=0;
    return
$liczba;
}

?>

The difference is that it returns null when the argument isn't a number at all.
up
-17
svein dot tjonndal at gmail dot com
3 years ago
If you don't have/want GMP and are working with large numbers/currencies:

<?php
function mb_abs($number)
{
  return
str_replace('-','',$number);
}
?>

No need to worry about encoding, as your numbers should all be basic (ANSI) strings.
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