gmp_cmp

(PHP 4 >= 4.0.4, PHP 5)

gmp_cmp — Confronto di numeri

Descrizione

int gmp_cmp ( resource $a , resource $b )

Restituisce un valore positivo se a > b, zero se a = b e negativo se a < b.

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russell dot harper at springboardnetworks dot com ¶

2 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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