gmp_cmp

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

gmp_cmp — Compare des nombres GMP

Description

gmp_cmp(GMP|int|string $num1, GMP|int|string $num2): int

Compare deux nombres GMP.

Liste de paramètres

num1: Un objet GMP, un entier, ou une chaîne de caractères numérique.
num2: Un objet GMP, un entier, ou une chaîne de caractères numérique.

Valeurs de retour

Retourne une valeur positive si a > b, zéro si a = b et négative si a < b.

Exemples

Exemple #1 Exemple avec gmp_cmp()

<?php
$cmp1 = gmp_cmp("1234", "1000"); // plus grand que
$cmp2 = gmp_cmp("1000", "1234"); // plus petit que
$cmp3 = gmp_cmp("1234", "1234"); // égal à

echo "$cmp1 $cmp2 $cmp3\n";
?>

L'exemple ci-dessus va afficher :

1 -1 0

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 1 note

down

russell dot harper at springboardnetworks dot com ¶

14 years ago

I've encountered a memory leak in gmp_cmp if a literal string is used as the second value inside of loops. A workaround is to initialize first, then use the variable. I wasn't able to generate a minimum code sample, it's something more complicated, but I was able to fix it as follows:

<?php

$x = gmp_init(strval(mt_rand()));

// Depending on surrounding code, may have leaks
while (true)
{
    if (!gmp_cmp($x, '1'))
        print 'one'."\n";
}

// Usually doesn't have leaks
$one = gmp_init('1');

while (true)
{
    if (!gmp_cmp($x, $one))
        print 'one'."\n";
}

?>

＋add a note