gmp_cmp

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

    gmp_cmp — Compara los números

    Descripción

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

    Compara dos números.

    Parámetros

    num1

    resource de número de GMP en PHP 5.5 y anterior, o un objeto de GMP en PHP 5.6 y posterior, o un string numérico siempre que sea posible convertirlo a un número.

    num2

    resource de número de GMP en PHP 5.5 y anterior, o un objeto de GMP en PHP 5.6 y posterior, o un string numérico siempre que sea posible convertirlo a un número.

    Valores devueltos

    Devuleve un valor positivo si a > b, el cero si a = b y el valor negativo de a si a < b.

    Ejemplos

    Ejemplo #1 gmp_cmp() example

    <?php
    $cmp1     = gmp_cmp("1234", "1000"); // greater than
    $cmp2 = gmp_cmp("1000", "1234"); // less than
    $cmp3 = gmp_cmp("1234", "1234"); // equal to

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

    El resultado del ejemplo sería:

    1 -1 0

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    User Contributed Notes 1 note

    up
    1
    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";
    }

    ?>
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