PHP Conference Japan 2024

gmp_sign

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_signSign of number

Açıklama

gmp_sign(GMP|int|string $num): int

Checks the sign of a number.

Bağımsız Değişkenler

num

Either a GMP object, or a numeric string provided that it is possible to convert the latter to an int.

Dönen Değerler

Returns 1 if num is positive, -1 if num is negative, and 0 if num is zero.

Örnekler

Örnek 1 gmp_sign() example

<?php
// positive
echo gmp_sign("500") . "\n";

// negative
echo gmp_sign("-500") . "\n";

// zero
echo gmp_sign("0") . "\n";
?>

Yukarıdaki örneğin çıktısı:

1
-1
0

Ayrıca Bakınız

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User Contributed Notes 2 notes

up
18
thomas at zilliox dot me
13 years ago
Hi !

If you don't have the GMP extension, the sign function is really simple to code.
Here an example of implementation :

<?php
function sign( $number ) {
return (
$number > 0 ) ? 1 : ( ( $number < 0 ) ? -1 : 0 );
}

echo
sign( 500 ); // Return 1
echo sign( -500 ); // Return -1
echo sign( 0 ); // Return 0
?>

Thomas.
up
12
Andrew Martin
7 years ago
Using a spaceship in PHP7:

<?php
$sign
= $number <=> 0;
?>
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